As of the time of this post, the chat is up and working.

I believe when you follow, IS Boxer sends F11 (plus a modifier key) to warcraft.
Check that you don't have F11 + the modifier used by Slot 5, assigned to anything in warcraft.

Will the toon on account 5 correctly assist and attack?
Or it specifically follow which is broken, while other FTL stuff works?
If they're all down, check that the IS Boxer addon is enabled for this account/character.