Interface slow/buggy with two user accounts?

I've recently created a second user account on my 2009 27" iMac and ever since I've been having weird things happening, such as flash videos in safari becoming unresponsive (literally frozen) untill I move the safari window, which gets the video to play for a few more seconds, then it freezes again... Also, GarageBand does the same thing, when I press play I hear my music, but the play head freezes in place after a few seconds and the only way to get it to move again is to jiggle the GarageBand window, switch to another Space and switch back or press CMD ALT ESC to bring up the force quit menu (not actually force quitting the application, just the action of bringing up the menu is enough to get GarageBand to refresh and start playing again...). These methods also work with safari.
Quitting and reopening the applications doesn't fix the problem and restarting the computer brings temporary relief, but it always comes back. Sometimes safari is open on both user accounts, that might be causing the problem, I'm not sure. I do know that it started at the same time I created a second account.
So whats going on? I'm thinking it's maybe a graphical issue? I've tried doing a permissions and disk repair and while my hard drive was found corrupt, the repair didn't seem to make a difference. Is my only option here to delete the second account? Would that even work? Or is a trip to the apple store in order? I'm hoping someone can shed some light on this issue since ive never come across a bug in OSX that I couldn't fix myself!
Thanks

A trip might be in order but not yet. First run software update, if your profile is correct you're a version behind as 10.6.8 is current, there may neither updates as well. Second reset the SMC and pram
To reset the SMC
Shut down the computer.
Unplug the computer's power cord.
Wait fifteen seconds.
Attach the computer's power cord.
Wait five seconds, then press the power button to turn on the computer.
To reset PRAM/NVRAM
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

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