I would add that I do not have and have I have never installed Photoshop.
One thing that does seem to run thru this thread is the fact that we have upped the cursor size in System Preferences: Accesibility: Display?
As you may recall, they changed that between Lion and Mountain Lion. Lion it didn't scale properly...was jaggy. Now it is beautiful to look at, but is contributing to this issue?
I run Firefox and Finder, that's about it for 90% of the time. I might have Skype and Itunes running in the backgroud.
The "disappering cursor" always seems to happen when some flash-based web page (like You Tube) is in the front tab. Moving and clicking in the Finder somewhere, then going back ALWAYS fixes it...but only for a few moments.
Personally, I blame Flash. But, SOMETHING is causing it...and whatever that something is started for me on Mountain Lion.
ANNOYING!
1. Anybody get this using just Safari and Finder?
2. Is Photoshop linked for sure (Adobe...hmm...) or is it just cuz that's such a huge usage by long-time users?
3. Is everybody using the Accesibilty options to bump cursor size in all cases?
4. I'm on a totally "vanilla" 21" iMac...never even used that much...and the behaviour began as of Mountain Lion.
For what it's worth, anyhoo. I guess we can hope it's fixed in Mavericks?