I'm getting a bit of a problem with mirrors when I play online at the moment. (Hosting a LAN server)
I've only used the SimHQ Skoda mod, so that's all I know it's happening on, but on some events the mirrors will not load properly. They are not off, you can still use the button to change between states. Off is the usual grey, and on is very similar, but seems to flicker through pinky grey, to bluey grey and so on.
Its usually fine in qualifying, but it occurs very frequently when the race starts, but not every time. Could really do with solving the issue before the SSTCC begins as it would be a huge problem for me!
I'll do some more testing soon and see if anything else appears to be linked to it.