I am not at a real PC right now. Does clip playback work when using a jpeg stteaming method? The preview tooltip also uses jpegs.FYI ...
After upgrading to BI v5.2.9.21, the clips list in UI3 v113 no longer shows a video preview, just a snapshot . The "clock" at the top of the preview window still changes rapidly but the picture doesn't change. The full screen live view works well, including showing the motion overlays (which I have switched on at the moment).
(I've tried browser: Chrome/new Edge, clearing caches, BI viewer: normal/"add motion overlays", quality: 4k/JPEG HD.)
The video preview works again if I revert to BI v5.2.9.20
The .21 patch fixed a web server bug related to jpegs and likely created this bug. Please report it to BI support. Also a temporary workaround MAY BE to turn off HTTP keep-alive in web server advanced, as that was related to the bugfix in .21