I did have one select_multiple using it, but that was just one of many questions to fail. I was primarily using it to count repeats. I was able to figure out what was going on with esri support not too long ago.
The suddenness of this change wrecked havoc on a lot of my already published forms which just started failing out of the blue. I ended up adding the Count function for the repeats into my survey as Calculate fields. In my testing though, there was an extra layer of annoyance added in this update... I had to add Calculates (to count the repeats) both inside AND outside the repeat to account for different use cases within the template. For instance, having a single "master" Calculate for a specific repeat, while convenient, would fail parsing if that Calculate was located outside a repeat in the XLS, but used inside a repeat of the template. This wasn't the case previously and just adds an extra level of complexity (and silliness. I just add a second calculate inside my repeat and made it equal to the one outside...)
Once the problem was identified, I was able to get everything working again.
