Can't get rid of the brush tool

I've been using photoshop cs5 for a while now, but recently a bizarre bug has surfaced ...
I often can't activate any tool but the paintbrush. When i start up the application, the brush tool will be selected. I can click other tools in the tool palette, and they highlight as if activated. But they aren't. The brush tool remains active.
This doesn't happen all of the time (much to the annoyance of our tech support), and sometimes i *can* eventually select the other tools. But it happens enough to be extremely annoying. Sometimes it occurs when i exit photoshop -- eg by clicking on the desktop -- and then return to it.
Any thoughts? thx!
Note: this is an office mac for which i have no admin rights.
Our tech support has already trashed my prefs and completely reinstalled the app.
They are stumped, so i turn to you Virtual Mavens.
Photoshop CS5 Extended v12.0.4 x64
MacBook Pro
2.53 GHz Intel Core i5
8 GB ram 1067 MHz DDR3
OSX 10.6.7

Hello! Here is the usual procedure when something goes wrong with Photoshop:
1) reset the tool (right-click on the tool icon in the Option Bar, select reset tool)
2) recreate Photoshop's preferences file.
See this FAQ: http://forums.adobe.com/thread/370739?tstart=0

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