99 times out of 100, the bug is yours. Sometimes you really do run into oddball stuff though. The most memorable for me was a bug that only surfaced after you p

99 times out of 100, the bug is yours. Sometimes you really do run into oddball stuff though. The most memorable for me was a bug that only surfaced after you printed something - the printer driver modified the floating point rounding mode and didn't restore it, resulting in some subtle failures of floating point calculations that followed.