I also have this problem. It appeared after the last update. No issues before.
Specifically, the "Music" button on the home screen and the "virtual earth" button as pictured above display in yellow. Switching from day to night mode does not affect the color.
I am running a custom skin that worked without issue in previous releases. However, it's not very "custom"...really I just changed button location and deleted some buttons that were unnecessary for my system.