Also, in response to some questions/speculations:
I'm having the issue outside of Flex. I'm only using a trackpad, no mouse. It happens while editing and in play mode as well; if I so much as bump the trackpad, the view will rapidly shift away from 'follow' back to about measure 8. Also notable, the spot that it jumps to is the first occurrence of an audio track- up until that point there are only MIDI tracks in the song. And I've tried opening a duplicate copy of the file saved on my external hard drive (because why not) and the same glitch persists. There are no evident triggers, it happens right when I open the project and scroll around a couple quick times.
Would really appreciate a solution to this... thanks!
**EDIT**
I deleted my .plist files associated with Logic Pro X and the problem seems to be gone... here's hoping!
***EDIT 2***
The problem came back... not sure what prompted it, but it's back... *sigh*