Description of problem:

The mouse cursor spontaneously changes size from the relatively small Bluecurve-mousecursor to around twice as big. When hovering around, the mouse cursor then is "big" when above windows started after the size-increase, but remains "normal" when above windows that were already there.

Then I go to the Mouse settings in the KDE System Settings, I choose a different cursor, apply, and then change back to Bluecurve, apply. This causes the mouse cursor to be "normal" again, above every window. Well, for some time at least.

Because after some time, sometimes a few hours, sometimes a couple of minutes, it'll start over again.


Version-Release number of selected component (if applicable):

It's Fedora 12 on x86_64. I'm running several Fedora-boxes and I notice that this issue is only affecting the workstation with a 30" monitor (2560x1600@60Hz on a DELL 3008WFP), so maybe the screen resolution has something to do with it.
I noticed that during the boot process there is also initially a bigger mouse cursor, but during some flickering the mouse changes to normal, before the login screen.

I have an nVidia GPU, and I'm using Noveau.
01:00.0 VGA compatible controller: nVidia Corporation Device 0659 (rev a1)

Needless to say, I install updates regularly. I've seen this behaviour since installing Fedora a couple of weeks ago, and no update so far has changed it.

How reproducible:

Well I'm not sure. On my workstation it's just "use the computer" and it'll happen at random intervals. On any other Fedora 12 box I haven't seen this issue.
I'm using KDE but I have the impression (not quite sure though) that Gnomish applications (like Firefox and Thunderbird, and especially the Flash-plugin in Firefox) trigger this behaviour more often than KDE applications. Not exclusively though, I've seen it happen on KDE applications too.