(sometimes) My edits (positioning/masking/...) aren't correctly rendered in the viewer.
Here you see 2 screenshots where I added a mask, but it isn't properly shown. You see the green mask, but the view renders it on a other way.
After Effects 188.8.131.52 - Creative Cloud CC
Restarting the current AE-project solves this. But it happens too much!
The problem is impossible to diagnose with the screenshots you have provided. If it's not a cache problem then we need to see the entire project with all modified properties of the layer that is giving you problems revealed. Do this by selecting that layer and pressing the U key twice, take a screenshot and then drag it to the Reply field on this forum. There's probably a user error somewhere in the project. If restarting AE solves the problem then it's probably a cache issue that can be solved by purging.