I'm having a similar problem. All BUSH trips are CTD when FSUIPC is working.
Just read from another FORUM that FSUIPC might be the problem so I tried WITHOUT FSUIPC7 - 2021-01-09 version and Bush flight worked.
Someones put the error on LNM, that I tried first. But finnally was the FSUIPC.
In any case SWIFT connected to VATSIM without FSUIPC and I have no other add-on.
I think I will put FSUIPC to rest for some time hoping for a VERY NEEDED SAVE/LOAD functionality.
In any case will wait for next version of FSUIPC7.
Since this is my first posting ever, I would personnally thanks Mr. John Dowson for having give me so many years of satifactory FS experience!!!
Cheers,
Gualdemar
VATID 832940