CC 2015 has quite a number of bugs in it still. Happily, there is an update coming out that is going to crush a lot of bugs. Sadly, it's not until the end of the month.
Hopefully this update will ease a lot of our frustrations.
I'm working in AE 126.96.36.199 on Windows 10 and we still encounter that exact same problem... Mostly working with shapelayers this happens VERY often and is VERY time consuming. Actually it is more like not being able to work properly. Closing the project and reopening it solves the problem (so you can at least save the AE-restart-time). Also just deleting the shapelayer helps...
Any words from Adobe yet?
> Any words from Adobe yet?
We have a fix targeted for release next week.
I too have encountered this exact issue. I contacted Adobe support and was informed that it is a known issue. Fortunately it looks to be resolved in a patch/fix next week =) As a workaround and a time saving measure, instead of closing your project and reopening it, just save it and then open the same project while it is still open. It acts sort of like a refresh and is relatively fast.