After my 10.4.4 upgrade (from the 10.4.3 previous upgrade) on my iBook G4 12", I'm somehow disturbed by the look of my MacOS X top bar... I don't know the exact word for that.
You can check this picture to see the bug (hint: top right corner) and this Apple Discussion for a way to fix this bug in the following hours or days. I will keep you posted right here if something new appears on my desktop (like a green bar, a red robot invasion or something like that).
Update #1: Raph suggests me to have a look at Iridium. I will ty that soon... I'm still waiting for a tip from Apple Discussion.