Trying to take the backpack out of the ME terminal (all terminals have the same effect) instantly crashes the game. The best I can guess is that Applied Energistics thinks I am removing a drive from the terminal which is not possible normally and does not have a handler for that.
There are several drives of varying sizes (all mostly full) within the backpack which is a maximum size backpack (CompactStorage)
I have tried removing the backpack with MC edit, but I am new and gave up after about 30 minutes. I don't want to just delete the backpack or drive, the backpack has literally all my items aside from a few bulk things (I was transferring storage over from previous setup).