A lot of menus in the games I make rely on just changing the font colour as you move up and down on the arrow keys, however in one of the recent updates (not sure when, I haven't been very active of late) this has stopped working when webGL is enabled.
Works fine when it's disabled though, which suggests to me it may have been broken when there was that update that prevented webgl text always being at the top.
Anyway, here is a capx demonstrating what's going on:
http://www.jargogle.co.uk/test/FontColourChange.capx
Hope it can be fixed as it's broken the menus in a lot of my games...