Getting crashes with ~8MB files.
Can you attach this 8Mb worksheet?
Unfortunately I can't due to IP restrictions. I did find that I could compare versions of it after disabling or removing the rather large input data files and re-saving, then just comparing the text and math regions with no outputs. The files without input data were still over 7Mb.
Do you have any chance to upgrade to the latest service release Mathcad 15 M045?
Can't in the short term, this is a corporate license and company PC. Do you have reason to believe this issue is corrected in v15 M045?