I haven't been able to track this down to a repeatable problem, but it's driving me crazy.
After upgrading from 6.x to 7.0, I occasionally will have an editor window suddenly scroll to the top of the page. It's almost always after switching between open files, but it sometimes is immediate and sometimes after approximately 1 second. I never experienced this in version 6.x/
Most of the files I'm editing are PHP, and most are classes, so it could be that it's jumping up to the initial class declaration. Could I be hitting some new keyboard shortcut accidentally?
I'm running on Mac OS 10.8.5.