After opening Premier in 25.6.0 Build 31 (Beta), Mercury Transmit doesn't transmit to the monitor.
I have to go into Preferences | Playback, just click OK, and it starts working. (Didn't have to change anything because the proper monitor is still selected.)
I thought it might have to do with the beta upgrade, but it fails after the app restarts, and works again after the reset.
Graphics card is nVidia 5080. On Windows 11.