Working with 2 Composition Viewers isn't possible.
I work on interlaced footage, so I've to pre comps the rotobrush layer in a 50 FPS comp,
while maintaining my footage for final render in a 25 FPS comp.
My general workflow is LOCKING the 25FPS Composition window on one screen, while the work itself is done on another screen with another Composition Viewer. so I can use it to monitor the final outcome of the rotobrush.
this doesn't seem possible, the Rotobrush just freezes& the progression bar just keeps on looping,
once i unlock the Composition Viewer of 25FPS and all Composition Viewer are on the working timeline everything is back and working.
Thank you for reporting this issue. We haven't yet been able to reproduce the scenario you have described using QuickTime DNxHD 50i footage and docking/locking the Composition panel next to the Layer panel. Are you still experiencing this issue in the latest Beta build ( 18.104.22.168 as of today )?
If possible, could you provide your system specs and possibly a screen recording/video of how you have your panels set up when you encounter the looping progression bar? It would be most helpful if you could send a collected version of your project to firstname.lastname@example.org along with the specs and recording.
Thanks again for reporting this issue, and thanks for any additional information.