Well, after 5 years of operating the site and using 28 (sorry, I was wrong above.. recounted and it's not 24) mods, never had a problem that brought down the site, until I installed 4.1.2 of this mod on our 4.1.3 vBulletin install.
So, I have no idea why this one would do it, except we are operating Digital's user map add-on and Memcache (with vbOtimize), which might be a factor. I only say that because your mod is the only one we use that interacts with that mod, so I thought there might be some cause and effect.
Anyway, again .. no big deal as this add-on isn't mission critical ...
Thanks for your efforts though ..
Regards,
Doug