It's happened once so far.
A client was testing the latest version of my product before putting it into use; after a week of testing they were ready to rollout, but I wanted to ensure that a small change was included (the "___" to "_:" modification I make with each release), and I updated to PR14 at the same time. They tried this build, got the error. I've done a clean recompile, and they are trying it again today.
If it happens again, I'll try to get more information collected.