Sam Oates' Crash of the century

While working on my transcription of the bluecoats 2015 show, I pulled the trumpet parts out of the main score in order to work on the features and try to fix a few of the chords. It is posted here: trumpet parts bluecoats 2k15.mscz || Now, the score is currently 564 measures long, with probably 30+ instruments, so its already a little unstable (but i understand why on that part) but I decided i wanted to transfer it into sibelius 7 and work on reducing the 5 trumpet parts to 4 trumpet parts. I successfully did this in probably 2 and a half hours (from about 10:30 to 12) and i transfer it back into musescore.... everything was going fine until i tried to paste the trumpet parts back into the full score and it said that the tuplets were trying to cross a barline. So I went through every measure and checked every time change (there is ALOT) and i found that all the tuplets were in the right spot and all the time signatures matched up. So i decided to redo all of the time signatures in the trumpet score and it proceeded to crash so many times that the recovered score is now a white piece of paper with nothing on it.

I have no idea what happened or how it happened, but that is what went down this evening!
THANKS - Sam Oates