Worked on a profile for a total of about 10 hours, At least two wives, only one with sources - but she had several previous names, so LNAB uncertain, children in censuses with different surnames. Had extensive notes regarding problems and future research possibilities.
I would have sworn I saved changes and left the edit screen before doing a computer reboot. But I guess I didn't. Now, I'm just swearing!
I suppose I can recreate the data in about half the time, but somebody should whack me on the head and tell me to be more careful!