Are you sure the minion actually didn't change? If you are looking at the pets.php page, it's on a cache so it might not update with the correct minion for a couple minutes.

Thank you! Just wanted to double-check before I pass this to (I'm assuming this is one of the problems cropping up after site downtime)

Have you experienced this again?

Has this happened recently? Do you think it may have happened due to site lag?

...I just zapped a testing pet a few dozen times (with a debug setting to make it always choose the "change minion" option) and I was not able to run into this problem. It even changed it into the specific minions in the first post a few times successfully.

After looking at the code, I think it's likely that this was due to lag or some other database error. I've made an edit to the code that it will double-check and tell you if the minion change failed for some reason, instead of saying the minion changed when it did not.

It's been a couple months without reports - Has anyone noticed this happen recently? We have made several changes to the website that may have resolved this as a side effect since the last report.