diff --git a/internal/executor/executor.go b/internal/executor/executor.go
index 002612bc..ea123f56 100644
--- a/internal/executor/executor.go
+++ b/internal/executor/executor.go
@@ -1933,7 +1933,16 @@ func (e *Executor) executeTask(ctx context.Context, task *db.Task) {
 
 	// Update final status and trigger hooks
 	// Respect status set by hooks - don't override blocked with done
-	if result.Interrupted {
+	if result.Requeued {
+		// The poller exited because the task was re-queued (e.g. the user flipped a
+		// blocked task back to "In Progress"), NOT because it was cancelled. Leave the
+		// task in 'queued' and let the worker pick it up for a fresh run — do NOT write
+		// backlog. Releasing this run's slot (via the deferred runningTasks cleanup)
+		// plus the worker's poll is enough; the fresh run's KillAllWindowsByNameAllSessions
+		// tears down the stale window, so no duplicate session lingers.
+		e.logLine(task.ID, "system", "Task re-queued - starting a fresh run")
+		e.TriggerProcessing()
+	} else if result.Interrupted {
 		// Explicitly set to backlog - don't assume Interrupt() already did it,
 		// as the interruption may have come from pollTmuxSession detecting a
 		// stale status or context cancellation.
@@ -2414,6 +2423,7 @@ type execResult struct {
 	Success     bool
 	NeedsInput  bool
 	Interrupted bool
+	Requeued    bool
 	Message     string
 }
 
@@ -4094,9 +4104,12 @@ func (e *Executor) pollTmuxSession(ctx context.Context, taskID int64, sessionNam
 					return execResult{Success: true}
 				}
 				if task.Status == db.StatusQueued {
-					// Task was re-queued (e.g. retry) - stop polling so the
-					// worker can pick it up fresh without a duplicate session
-					return execResult{Interrupted: true}
+					// Task was re-queued (e.g. retry, or the user manually flipped a
+					// blocked task back to "In Progress") - stop polling so the worker
+					// can pick it up fresh without a duplicate session. Report this as
+					// Requeued, NOT Interrupted: an interrupt is finalized to backlog
+					// (a cancellation), which would immediately undo the requeue.
+					return execResult{Requeued: true}
 				}
 			}
 
diff --git a/internal/executor/executor_test.go b/internal/executor/executor_test.go
index 254b5fa1..71a9588e 100644
--- a/internal/executor/executor_test.go
+++ b/internal/executor/executor_test.go
@@ -1936,3 +1936,50 @@ func TestBuildPromptUsesFileKindInstructions(t *testing.T) {
 		t.Errorf("prompt should include the file kind's instructions; got:\n%s", prompt)
 	}
 }
+
+// TestPollTmuxSessionRequeuesOnQueuedStatus verifies that when a task's status
+// flips to "queued" while its poller is still alive (e.g. the user manually
+// changes a blocked task back to "In Progress"), pollTmuxSession reports the
+// exit as Requeued — NOT Interrupted. Reporting Interrupted would cause
+// executeTask to finalize the task to backlog, immediately undoing the requeue
+// (github.com/bborn/taskyou/issues/674).
+func TestPollTmuxSessionRequeuesOnQueuedStatus(t *testing.T) {
+	tmpFile, err := os.CreateTemp("", "test-*.db")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.Remove(tmpFile.Name())
+	tmpFile.Close()
+
+	database, err := db.Open(tmpFile.Name())
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer database.Close()
+
+	if err := database.CreateProject(&db.Project{Name: "test", Path: "/tmp/test"}); err != nil {
+		t.Fatal(err)
+	}
+
+	exec := New(database, &config.Config{})
+
+	// Task is queued (as showChangeStatus writes when mapping "In Progress").
+	task := &db.Task{Title: "Test task", Status: db.StatusQueued, Project: "test"}
+	if err := database.CreateTask(task); err != nil {
+		t.Fatal(err)
+	}
+
+	// The DB-status check is the first thing pollTmuxSession does each tick, so it
+	// returns before touching tmux. Give it enough headroom for one tick.
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	result := exec.pollTmuxSession(ctx, task.ID, "nonexistent-session")
+
+	if !result.Requeued {
+		t.Errorf("expected Requeued=true for a re-queued task, got %+v", result)
+	}
+	if result.Interrupted {
+		t.Error("expected Interrupted=false for a re-queued task; a re-queue must not be finalized to backlog")
+	}
+}
diff --git a/internal/executor/task_executor.go b/internal/executor/task_executor.go
index 2a6a5122..5c435852 100644
--- a/internal/executor/task_executor.go
+++ b/internal/executor/task_executor.go
@@ -12,6 +12,7 @@ type ExecResult struct {
 	Success     bool   // Task completed successfully
 	NeedsInput  bool   // Task is waiting for user input
 	Interrupted bool   // Task was interrupted by user
+	Requeued    bool   // Task was re-queued (e.g. manual "In Progress") and should resume via a fresh run, not be treated as a cancellation
 	Message     string // Status message or error
 }