Graphics slightly messed up

After installing carbon Rom by Mr Amid a few days back, I now find my mate displaying part of the graphics too wide and or replaced with green.

For instance:
- The normally orange progress indicator in firefox is now garbled green/grey and much wider
- Some icons on the home screen were much bigger, unreadable and garbled in the same way as progress indicator
- One icon was moved to another home screen, stayed garbled but during moving was normally visible, and then could not be moved back to the fist home screen, though it could still be moved
- safety gesture area on lock screen is full green where it should be black.

Anyone have had some similar experience?

I have read http://forum.xda-developers.com/showthread.php?t=874274
but this seems totally different

A reboot fixes it but it seems to come back after a while...