1. Terminal - The background under the text become transparent (the rest of the window not). Clearly not a fancy desktop effect, as sometimes the edge is not straight, or it even flickers a bit when typing. It really have the feel of a bug...
Hmmm, I'm not sure if I had the exact same issue or not, but it surely sounds like it. By any chance, does the Options portion of the "Setup the graphical server" configuration utility in PCC have an "Enable RENDER Acceleration (this may cause bugs displaying text)"
option that is checked? If it does, uncheck
it. If your problem is the same one I had, this will fix it.