BUG! Screw over my best playthrough yet will you?

Aarrrgh!

It would seem IVAN is conspiring against me, as this is the 5th time a bug has wiped out one of my best characters.
Anyway, on to the bug:
Upon trying to enter Gloomy Cave 7, "Fatal Error! Unable to place Secret Room #1"

hmm, never gotten that one before

I'm not familiar with that one either. Try downloading IVAN again. Quite possibly you created it while messing with the code.

Wouldn't have been through messing with the code, I have a clean version of IVAN which I use for serious playthroughs.

Regardless of the cause, I still recommend downloading it again.