# linux QA Video Report

- Generated at: 2026-04-01T14:08:28.963Z
- Model: `gemini-3-flash-preview`
- Target: https://github.com/Comfy-Org/ComfyUI_frontend/issues/10688
- Source video: `./qa-artifacts/qa-report-Linux-23852142721/qa-session.mp4`
- Video size: 921.9 KB

## AI Review
## Summary
The video confirms the reported bug where the sampler preview disappears (or fails to appear) after a context switch or page refresh. Although a preview was not explicitly seen *before* the switch (as the user refreshed almost immediately after starting), the sampler continued to run for the duration of the video without ever displaying a preview image, which is the expected behavior for a running KSampler.

## Confirmed Issues

### Sampler preview missing after context switch
`HIGH` `00:14` `Confidence: High`
When a sampling process is active and the user refreshes the page or switches tabs, the intermediate preview images are no longer displayed on the KSampler node, even though the node remains in an active state (indicated by the green border and progress bar). This confirms the reported state synchronization issue where websocket preview data is lost upon UI reconnection.

**Evidence:** At 00:14, the KSampler node is visibly running (green outline, progress bar near completion) following a page refresh at 00:07 and a tab switch at 00:12. No preview image is visible within the node or elsewhere in the UI.
**Suggested Fix:** Ensure that the frontend correctly re-subscribes to or retrieves the active preview state from the websocket after a reconnection or tab switch, ensuring messages are associated with the correct graph tab.

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## Overall Risk
The risk is **high** as the loss of real-time visual feedback during long-running generative tasks significantly degrades the user experience and makes it difficult to monitor or interrupt unsatisfactory generations early.

## Verdict
REPRODUCED

{"verdict": "REPRODUCED", "risk": "high", "confidence": "high"}