diff --git a/apps/desktop/src/chat/ChatHubWidget.tsx b/apps/desktop/src/chat/ChatHubWidget.tsx
index 8d3da45..cabe10c 100644
--- a/apps/desktop/src/chat/ChatHubWidget.tsx
+++ b/apps/desktop/src/chat/ChatHubWidget.tsx
@@ -118,11 +118,13 @@ export function ChatHubWidget() {
   }
 
   const handleExpand = async () => {
-    setIsMinimized(false)
     try {
       await invoke("set_hub_minimized", { minimized: false })
+      // Aguarda a janela redimensionar antes de atualizar o estado
+      setTimeout(() => setIsMinimized(false), 100)
     } catch (err) {
       console.error("Erro ao expandir hub:", err)
+      setIsMinimized(false) // Fallback
     }
   }
 
@@ -201,7 +203,7 @@ export function ChatHubWidget() {
 
   // Expandido - mostrar lista
   return (
-    <div className="flex h-screen flex-col overflow-hidden rounded-2xl bg-white shadow-xl">
+    <div className="flex h-full flex-col overflow-hidden rounded-2xl bg-white shadow-xl">
       <ChatSessionList
         sessions={sessions}
         onSelectSession={handleSelectSession}
diff --git a/convex/liveChat.ts b/convex/liveChat.ts
index d4bde33..3b2c0f4 100644
--- a/convex/liveChat.ts
+++ b/convex/liveChat.ts
@@ -896,6 +896,47 @@ export const autoEndInactiveSessions = mutation({
   },
 })
 
+// Mutation para corrigir sessoes antigas sem campos obrigatorios
+export const fixLegacySessions = mutation({
+  args: {},
+  handler: async (ctx) => {
+    const now = Date.now()
+
+    // Buscar sessoes ativas que podem ter campos faltando
+    const activeSessions = await ctx.db
+      .query("liveChatSessions")
+      .withIndex("by_status_lastActivity", (q) => q.eq("status", "ACTIVE"))
+      .take(100)
+
+    let fixed = 0
+    let ended = 0
+
+    for (const session of activeSessions) {
+      // Se sessao nao tem lastAgentMessageAt, adiciona o valor de startedAt
+      if (session.lastAgentMessageAt === undefined) {
+        // Sessao muito antiga (mais de 24h) - encerrar
+        if (now - session.startedAt > 24 * 60 * 60 * 1000) {
+          await ctx.db.patch(session._id, {
+            status: "ENDED",
+            endedAt: now,
+            lastAgentMessageAt: session.lastActivityAt ?? session.startedAt,
+          })
+          ended++
+        } else {
+          // Sessao recente - apenas corrigir o campo
+          await ctx.db.patch(session._id, {
+            lastAgentMessageAt: session.lastActivityAt ?? session.startedAt,
+          })
+          fixed++
+        }
+      }
+    }
+
+    console.log(`fixLegacySessions: fixed=${fixed}, ended=${ended}`)
+    return { fixed, ended, total: activeSessions.length }
+  },
+})
+
 // ============================================
 // UPLOAD DE ARQUIVOS (Maquina/Cliente)
 // ============================================
diff --git a/src/components/tickets/ticket-summary-header.tsx b/src/components/tickets/ticket-summary-header.tsx
index 8242bf3..95b8418 100644
--- a/src/components/tickets/ticket-summary-header.tsx
+++ b/src/components/tickets/ticket-summary-header.tsx
@@ -343,13 +343,38 @@ export function TicketSummaryHeader({ ticket }: TicketHeaderProps) {
   const machineOnline = liveChatSession?.machineOnline ?? false
   const hasActiveSession = Boolean(liveChatSession?.sessionId)
   const ticketHasAssignee = Boolean(ticket.assignee)
-  const canStartChat = hasMachine && !hasActiveSession && isStaff && ticketHasAssignee
+  // Permitir iniciar chat mesmo sem responsavel - vai atribuir automaticamente
+  const canStartChat = hasMachine && !hasActiveSession && isStaff
 
   const handleStartLiveChat = async () => {
     if (!convexUserId || !ticket.id || isStartingChat) return
     setIsStartingChat(true)
     toast.dismiss("live-chat")
+
     try {
+      // Se nao ha responsavel, atribuir o usuario logado automaticamente
+      if (!ticketHasAssignee) {
+        toast.loading("Atribuindo responsavel...", { id: "live-chat" })
+        await changeAssignee({
+          ticketId: ticket.id as Id<"tickets">,
+          assigneeId: convexUserId as Id<"users">,
+          actorId: convexUserId as Id<"users">,
+          reason: "Atribuido automaticamente ao iniciar chat ao vivo",
+        })
+        // Atualizar estado local
+        const agent = agents.find((a) => String(a._id) === convexUserId)
+        if (agent) {
+          setAssigneeState({
+            id: String(agent._id),
+            name: agent.name,
+            email: agent.email,
+            avatarUrl: agent.avatarUrl ?? undefined,
+            teams: Array.isArray(agent.teams) ? agent.teams.filter((t): t is string => typeof t === "string") : [],
+          })
+        }
+      }
+
+      toast.loading("Iniciando chat ao vivo...", { id: "live-chat" })
       const result = await startLiveChat({
         ticketId: ticket.id as Id<"tickets">,
         actorId: convexUserId as Id<"users">,
@@ -357,18 +382,18 @@ export function TicketSummaryHeader({ ticket }: TicketHeaderProps) {
       if (result.isNew) {
         toast.success("Chat ao vivo iniciado", { id: "live-chat" })
       } else {
-        toast.info("Já existe uma sessão de chat ativa", { id: "live-chat" })
+        toast.info("Ja existe uma sessao de chat ativa", { id: "live-chat" })
       }
     } catch (error: unknown) {
       console.error("[LiveChat] Erro ao iniciar chat:", error)
       // Extrair mensagem amigável do erro do Convex
-      let message = "Não foi possível iniciar o chat"
+      let message = "Nao foi possivel iniciar o chat"
       if (error instanceof Error) {
         const errorMsg = error.message.toLowerCase()
         if (errorMsg.includes("offline")) {
-          message = "Máquina offline. Aguarde a máquina ficar online para iniciar o chat."
-        } else if (errorMsg.includes("não encontrad") || errorMsg.includes("not found")) {
-          message = "Máquina não encontrada"
+          message = "Maquina offline. Aguarde a maquina ficar online para iniciar o chat."
+        } else if (errorMsg.includes("nao encontrad") || errorMsg.includes("not found")) {
+          message = "Maquina nao encontrada"
         }
       }
       toast.error(message, { id: "live-chat" })
@@ -597,7 +622,8 @@ export function TicketSummaryHeader({ ticket }: TicketHeaderProps) {
   const hasAssignee = Boolean(currentAssigneeId)
   const isCurrentResponsible = hasAssignee && convexUserId ? currentAssigneeId === convexUserId : false
   const isResolved = status === "RESOLVED"
-  const canControlWork = !isResolved && isStaff && hasAssignee
+  // Permitir Play mesmo sem responsavel - vai atribuir automaticamente
+  const canControlWork = !isResolved && isStaff
   const canPauseWork = !isResolved && (isAdmin || isCurrentResponsible)
   const pauseDisabled = !canPauseWork
   const startDisabled = !canControlWork
@@ -605,14 +631,11 @@ export function TicketSummaryHeader({ ticket }: TicketHeaderProps) {
     if (isResolved) {
       return "Este chamado está encerrado. Reabra o ticket para iniciar um novo atendimento."
     }
-    if (!hasAssignee) {
-      return "Defina um responsável antes de iniciar o atendimento."
-    }
     if (!isStaff) {
       return "Apenas a equipe interna pode iniciar este atendimento."
     }
     return "Não é possível iniciar o atendimento neste momento."
-  }, [isResolved, hasAssignee, isStaff])
+  }, [isResolved, isStaff])
 
   useEffect(() => {
     if (!customersInitialized) {
@@ -1097,10 +1120,34 @@ export function TicketSummaryHeader({ ticket }: TicketHeaderProps) {
 
   const handleStartWork = async (workType: "INTERNAL" | "EXTERNAL") => {
     if (!convexUserId) return
+
+    // Se nao ha responsavel, atribuir o usuario logado automaticamente
     if (!assigneeState?.id) {
-      toast.error("Defina um responsável antes de iniciar o atendimento.")
-      return
+      toast.loading("Atribuindo responsavel e iniciando...", { id: "work" })
+      try {
+        await changeAssignee({
+          ticketId: ticket.id as Id<"tickets">,
+          assigneeId: convexUserId as Id<"users">,
+          actorId: convexUserId as Id<"users">,
+          reason: "Atribuido automaticamente ao iniciar atendimento",
+        })
+        // Atualizar estado local
+        const agent = agents.find((a) => String(a._id) === convexUserId)
+        if (agent) {
+          setAssigneeState({
+            id: String(agent._id),
+            name: agent.name,
+            email: agent.email,
+            avatarUrl: agent.avatarUrl ?? undefined,
+            teams: Array.isArray(agent.teams) ? agent.teams.filter((t): t is string => typeof t === "string") : [],
+          })
+        }
+      } catch (err) {
+        toast.error("Nao foi possivel atribuir responsavel.", { id: "work" })
+        return
+      }
     }
+
     toast.dismiss("work")
     toast.loading("Iniciando atendimento...", { id: "work" })
     try {