>>although my mini-tree, at the top of the Person tab becomes "detached" from the "selected person" often in FTM2014 and has never happened in any previous version<<
I think I'm having the same problem as you describe and I recall my problem started w/Windows 8.1 (don't recall it in W 8.0).
When working in the Person tab I notice that the main sections still display my chosen person but the mini-tree at the top has changed (usually to the spouse of the person I'm working on). Not sure this causes me any problem other than potential confusion on my part.
If this is the same as what you describe, I'd be interested in hearing how you address this issue (if you even feel it's an 'issue').
Sometimes I can stop this occurrence by closing FTM then reopening, although usually it takes a Windows reboot to fully clear. I have to admit it's possible for me to go several days w/o shut down or reboot, so I suppose there could be some file corruption that leads to this 'problem'.
Sorry to ramble off subject to this Thread but this is the first time I've notice another user mention this issue.