Mac Mini loses mouse on logout sometimes

We have a Mac Mini with multiple users. Seemingly randomly, but about once a day, when a user logs out, the mouse stops moving. The keyboard works, and I can remotely connect to it, but the mouse won't work again until I shut the machine down and power it back up.
I've reset the PRAM and the SMC, and tried swapping mice when it happens - nothing moves the cursor.
Weirdly enough, if I remotely login, and then go back to the Mini, I can see that the mouse's right button will work, but it won't still move and the left button does nothing. This is with 10.5.2 on a refurbished Intel Mini. I've tried memtest86; no errors were reported.
Any ideas? Will an archive and reinstall preserve the users?

I have the same problem with an Intel Mac Mini. Other users on another forum have experienced the same thing.
If the mouse is moved between logging out and the login screen appearing, the mouse is likely to be frozen. If you then log in using the keyboard only and log out again, the mouse will be unfrozen when the login screen reappears.
Users have reported the problem on a clean install of Leopard. Mine didn't have this problem on 10.4, but has done since the Leopard upgrade.
I've submitted a bug report for this problem.

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