...of reasons that I'm not aware of.

While working in a drawing, for the last three days, I was almost finished, when something went wierd in Solidworks. On the current page I was working on, my drawing views vanished, and after several rebuilds, nothing happened. Finally I started clicking back through the 17 pages, only to find my annotations were still there but no drawing views, and of the ones that remained, they were not in the same positions or the way I had formatted them.

When I got to the first page and saw my overview of my model, it was just broken. Parts that I had suppressed were now visible, and parts that I had added at some point were no longer there. It's as if the whole model rolled back to some period inbetween several changes I had made at the beginning of the week, before finalizing it, and starting on my drawing mid week.

Has this happened to anyone else?