I'll have to see your settings to figure out what the modification is doing wrong
I can't guess at what your settings are unfortunately
Can you send me a login via pm?
Update: since the 1.5 fix, it correctly recognizes connection types. On my home site, I have 4 forums enabled, when I change the connection type for one of them I get the errors. I would suggest running a global query something like
update forum set ei_active = 0;
and then go back and edit one forum and play with it's connection type, my guess is you may have accidently turned on a second forum as active
in future versions I'll code in a die loop so if it gets that error it'll like send an email to the admin or something, *shrug* I'll figure something out