Hi.
I'm going through something similar - except I don't plan to tear my PC apart (I hope :? )
I'm still a bit knew to FSUIPC, installed it about 3 weeks, and lately I've been suffering from FSX hangs, followed by the fatal FS error mesage and prompt to address it to MS. I mean, lately, more and more often, and now it happens everytime I run whatever mission.
Lets review what I did:
1) Installed FSUIPC and start configuring it. Cool program.
2) I started configuring it storing settings by aircraft. General assignmets for prop/turboprops; specific assignments for jets.
3) I noticed a hang once in a while. Didn't bother with it too much, there was no consistency - I couldn't recreate them, so I thought "if this is real, it will reveal itself sooner or later, too soon to trace it yet".
4) I continued configuring aircraft, this time assingning specific flap settings for each airliner, and yes, I was using the "Send to FSUIPC calibration" option, more and more, I just thought it was the best way to do it. Hangs become consistent. "Its time to sort this out".
5) I just made one test: disabled the FSUIPC.dll manualy. I didn't uninstall anything - just disabled FSUIPC from running on FSX load up.
6) FSX run ok, no more hangs. Enabled FSUIPC to load again. Hangs about five minutes from mission start, everytime. Disabled again - no hangs.
I'm having 3 days out of town work, and was wondering what to do next - sometimes its better do nothing and sleep a bit on the subject than start messing around without a clue. Then I made my mind about my next step: I'd clean up the FSUIPC ini file and start configuring axes again from the start. I was sure FSUIPC was pushing hard on something my rig couldn't cope with. Then I started reading this thread. In fact I started to read it earlier but when I reach the memory testing part, I thought "forget it, I aint got time to that, maybe I'll quit on FSUIPC instead". But I decided to read further on a few days later, till I reached the axes assignment option, then I thought "of course, my hangs grew up as I was using that option more and more, so that must be it!".
So, I'll be back to my PC before the weekend. I'll disable that "send to FSUIPC calibration" and start testing from there.
I'll report back then. Thanks for continuing this discussion, it probably saved some people lot of trouble (including me I guess).