I wanted to clear up the cache and did so but now I see a few things I no likey. 1st, now the apps all appear shaped like Android Market. Second, the screen contrast is messed up and the automatic dimming setting is weird and not bright enough. Also had to re-install a live app that got deleted weird!
What I would suggest would just be to either a) turn the phone off and remove the battery, then start it up again or b) back everything off and do a factory reset. Its probably just a memory error so turning the phone off will probably help but it also good be a file error so if it really bothers you just wipe the OS.