Error in loading experiment

Never tried this before, my latest experiment (with two weeks of work!) won't load: "The experiment load was not completed due to errors. See the diagnostic notebook for further information."

I cant find this diagnostic notebook, nothing pops up and searching the help files and menu listings isnt giving me anything, either.
OK, it seems I can't open ANY of my experiments... all of them give the same error message. In the menu, windows/other windows/notebooks is blank, so no diagnostic notebook is being loaded, either.

IGOR was working fine on friday... I am running Igor Pro 6.36 on a windows 7 64 bit system.
OK, I tried reloading IGOR and no change. Then I rebooted my computer (I had just started it up), and this seems to have resolved the problem, so I am assuming this had something to do with IGOR interfacing with my OS regarding the pathing to my data files, as the program itself started up without a hitch.
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Then I rebooted my computer (I had just started it up), and this seems to have resolved the problem


I have seen this resolve a lot of strange problems.

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my latest experiment (with two weeks of work!) won't load


This is a good opportunity to remind people to make frequent backups.

My paranoia is such that I make a backup at least every hour of files that I am actively working on at any given time. This applies to Igor and any other program that I use.