Brad,
Because I haven't updated MultiHack in 6 months or so.
I haven't even looked at the vB community as they have been even less supportive than the UBB community. If they have something that works better for them, more power to 'em.
As it stands, MultiHack probably won't be updated again. If I get a wild hair... but I wouldn't expect it. I'm glad that there are people that find it useful and still use it, I simply don't think there are many using it as a whole. If there are I haven't heard from 'em. My desire to continue a project is directly related to teh amount of feedback I get. If there is little to none, I have to assume it isn't something a lot of people will use.
I've got a lot of other projects I am working on as well. One of them is UBB related, but as to whether people will use it, we shall see.
I am working on a new website as and soon as that is done I'll be releasing it.
