Exactly - how - does the cursor appearance change? Your post did not make that clear.
Does it happen on every program you use? Or just one in particular?
Some programs have the ability to change cursor appearance.
It goes from an arrow- to a double sided arrow with a little circle in the center.
It's so hard to click on a link or anything because of how the arrow is positioned.
Then out of nowhere it changes back.
Have u figured this out yet. I started having the same issue recently. Thought it was a particular web site, as it started when I was using that site. But maybe not. The computer is also randomly locking up requiring a reboot. Using FF 21.0. I found a conflict with one extension causing google maps not to work but have not found the cause of this issue.
Apparently it is system related as u r using a different browser.
Last couple of days my otherwise reliable machine (windows 7) has started freezing, requiring reboot. Just now the mouse cursor changed to a Word-like cursor when you're adding text, but only partially visible, then a couple of minutes later went back to normal. This was with Firefox only running. When I just clicked on a link, again the cursor got all corrupted.
I wonder if its related to what you've had?
EDIT: fixed my problem - it was the graphics card. Too much dust in it, just needed a clean. Weirdly it was playing games fine, was only have the problem when on the desktop!