In an in-house beta our product was causing blue screens. We had some the crash reports and a I dug out the technical notes in how to decipher that gibberish. Still no real clue, but there was an address happened where it was supposed to happen. So I dumped our binary into two reversing tools, jumped to that address and looked at the surrounding code.
And sure there it was: A missing check when manipulating a C-string which could lead to out of bound access. Added a check BSOD's gone.