Well if Fell can track this down from the module error, more power to him. This is one he may not be able to reproduce. It doesn't seem to have to do with the size but it may have something to do with the IDE being opened for days, interaction with the O.S. if any of that is possible? The reason I ask is this. I saved the file, closed the IDE, reopened it, and guess what? Now I cannot reproduce the error! This reminds me of an O.S. problem where when everything else fails, just reboot!
So I'd say this is of little significance to the project, unless it's an easy find.
This certainly isn't as bad as crashing a QB64 exe, because the user mistakenly put a negative value into an array... x$(a) where a = -1, for instance. I suppose there might be a way to warn the user before the crash, but maybe not. At least whatever caused this error, didn't crash the IDE, that's win for the stability of this system.
Anyway Fell, don't spend too much if any time on this. It happened, I could reproduce it before I closed it out, but now it ain't happening no mo'.
Pete