Hey, I can see the screenshot. The model is trying to switch from Plan mode to Agent, but the switch is being blocked.
Most likely you previously clicked Don’t ask again or Never on the auto mode switching prompt. After that, all automatic Plan → Agent switches get silently rejected, and there isn’t a UI to reset this setting yet.
The team is aware of the issue. There’s no ETA yet, but your report helps us prioritize it. Related thread: How to re-enable "Switch to Plan Mode" countdown/reminder?