I'm going to try and look at this once I get the board updated to 6.5.4. At a quick glance, I couldn't see why the e-mails weren't working. The cron task is running, and the output looks the same as before.

The instant UBB codes stuff seems broken on another board that runs 6.5.2 as well, so that will hopefully come back in 6.5.4

I might have time Sunday to do the upgrade. Just never got around to it in the rush to prepare for E3.