Experiencing serious bugs with voiceover portable preferences on OS X 10.10.2 and newer

Hello all,
I am experiencing some very strange bugs with portable prefs and am wondering if anyone else can confirm this. I decided to use them for the first time this past week so that I could take my settings from my mac to the university machines in the programming lab without needing to change each machine individually. I noticed that enabling portable preferences on my Mac and syncing them to a flash drive worked well, but when I put the drive in another computer and enable my preferences I get the stock settings for everything and cannot change anything without the entire voiceover utility crashing. I then figured that possibly it was something wrong with my particular setup, and attempted using portable preferences from two other machines on my mac with the same results.
I have now tried this on 5 different macs and two different flash drives with exactly the same results. Whether or not I have admin rights on either Mac doesn't seem to make a difference. I have done a report to apple via the feedback assistant, but have not heard back. Can anyone confirm whether they experience this as well and when the issue started?
Thanks!
Megan