Yesterday, I tried to sync one of my trees using FTM2012 and half way through the sync my FTM just crashed. I restarted, loaded a different tree, and was able to sync that tree just fine. I then unloaded the secondary tree and went back to my primary tree and tried to sync again. This time, it synced without any problem.
Today, I tried to sync that primary tree once again, and once again the FTM software crashed in the middle of the sync. I repeated what I did yesterday - synced a different tree without any problem. I then went back to my primary tree and tried to sync it again. This time, FTM crashed again... it won't let me sync my tree. I even compacted the file and it still won't let me sync. The only difference between my FTM tree and the online tree is that I deleted a few people from my FTM tree.
This is really weird.