Twice now had deleted all objects (leaving empty layers) after importing an .obj into the project in one instance and simply moving an existing (dragging) in the other… Lost a days work 
It is never a good idea to do commercial or otherwise critical work in a WIP version of a software.
didn’t say it was either of those, but it was still a lot of work.. and not really the point
@pharris65 Did you try going back to an earlier saved version of the file? If this a a day’s work there should be several versions of your file, I assume.
well, because of the size of the file and the issue on OSX (one of the reasons I keep annoying you guys re: Worksessions) with autosaving, I turned versioning off.. - so yeah, I screwed myself, given this bug…
FWIW, with versioning turned off, saving a file will send an earlier version to the trash can.
-wim