As you move the mouse around in a Comp panel, the Info panel displays the RGBA values under your cursor.
If you leave the mouse pointer still, and use PgUp/PgDn to change the frame being displayed, the Info panel doesn't update, leaving you with out of date values until you move the mouse again. If you're trying to triage an issue with footage (eg trying to diagnose where in the pipeline a colour shift has occurred), that can be a problem. It can be worked around, but seems like something that ought to be corrected.
This is easily reproduced: animate a white shape moving across a black background. Position your mouse so it's over the shape, and the Info Panel will correctly show values of 1/1/1/1. Now use PgUp or PgDn keys to advance along the timeline until the white shape is no longer under the cursor; the Info Panel will still show 1/1/1/1 despite that no longer being true.
Can you please force the Info Panel to update on frame_change as well as mouse_move events, please? Being able to do this will save time when trying to track down glitches and other issues in footage. Thanks 🙂