Hi @Sergiy_Petrenko,
This is a confirmed UI bug that’s been reported by multiple users across platforms. The subagent is actually running in the background – it’s the progress display that’s stuck on “Starting up.” Your work should still be complete; you just can’t see the real-time status.
Regarding the OTLP theory: the telemetry behavior you’re observing with NO_STORAGE is separate from the subagent display issue. The two systems don’t share the same resource path, so the HTTP 400 responses from the trace exporter aren’t what’s causing the status to get stuck. The root cause is in the subagent UI state management, and our team is actively working on a fix.
You may also find this related thread helpful, where other users have confirmed the same pattern.
In the meantime, Reload Window (Ctrl+Shift+P → “Developer: Reload Window”) may temporarily restore the subagent display for the current session.
@theDanielJLewis — thanks for confirming. Same issue on your end — the subagent should be completing its work even though the UI doesn’t reflect it.