So on a PowerBuilder app I worked on last year (I know right...), suddenly the business users were reporting that they couldn't edit some of their prices! When they clicked save, the screen would refresh and lose their work.

We had recently upgraded the system to allow them to enter hundreds of prices at a time, much more than there had ever been. But that code wasn't anywhere near this part!

Tracking this down was really fun... By great fortune, I discovered the row the users were editing was the 99th row in the DataWindow. As it turned out, in the distant past (this is PowerBuilder, after all) the returns code "99" had been used as a flag to mean "cancel/refresh the screen".

I of course offered to "fix it right", but the powers that be wanted it fixed cheaply, so we just changed the flag to "9999". 😬