Premiere Pro Beta hangs indefinitely on exit, while stable Premiere 2026 closes normally
Premiere Pro Beta frequently hangs when exiting and has to be force-terminated in Task Manager. After Effects Beta shows the same behavior. Stable Premiere Pro 2026 on the same Windows system closes normally.
Troubleshooting already performed:
- Tested with empty projects.
- Reset preferences and caches.
- Removed third-party MediaCore plugins.
- Tested without Creative Cloud/CCXProcess startup.
- Tested different audio devices and with external audio hardware disconnected.
- Tested CUDA and OpenCL renderers.
- Removed problematic/duplicate LUTs.
- None of these changed the shutdown hang.
Important diagnostic finding:
Windows Wait Chain Analysis showed one Premiere thread waiting on another internal Premiere thread.
In Process Explorer, the waited-on thread contained calls from:
dunamis-ingest.dlldunamis_http_setSendRequestCallbackdunamis_ingest_updateMPEvent
This appears to happen during application shutdown.
Expected result:
Premiere Pro Beta should exit normally within a few seconds.
Actual result:
Premiere remains running indefinitely and must be terminated manually.
Additional information:
The same issue occurs in After Effects Beta, while stable Premiere Pro 2026 exits normally on the same machine.
I can provide additional Process Explorer stack traces or system information if needed.
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