looks like the adjustments they did on spaces introduced some bugs. assigning spaces to a mouse button only sometimes work. not fault with my mouse.i assigned the same button to expose and it works. sometimes, when spaces is activated the active window stays maximized, and does not follow the spaces 'sequence'....you have to get out of spaces and re activate to make it work. not big,but buggy still. does apple do bug fixes like this?or do they save up and cumulatively fix in a point update?10.5.4? BTW APPLE SPY, tell stevie jobs there is a problem with the Macbook Pro screens. vertical dark bands appear on the bottom half of screen..like as if backlight alternates, on and off..tell him current mbp users should get the new ones with new case when theyre out, free.