What is the snapshot?
Does the History panel have other steps?
The snapshot is just the interface of lightroom. The history panel doesn't have any steps.
Edit >> Preferences >> Performance (tab)
Lightroom >> Preferences >> Performance (tab) on Mac OSX
Uncheck the box “Use Graphics Processor”
Then click OK
Does that make any difference?
You could also try going into Preferences and unchecking the box that says "Show Photo in Navigator Upon Mouse-Over." There was an old bug, which may be related.
This fixed it.
Thanks a lot for the help!