this might have already been resolved by someone but i can't find how to fix this. i am trying to use spawner gui, i have tried everything, and the only way it even regesters is if i install it in the .jar. but unfortunately it seems to work perfectly fine up until you attempt to actualy use the gui, i click on the mob i want and nothing. the mob stays the same, and if i click on it again to check the gui, it is back on the origional mob. is there some way to fix this? please i am making a map and need this mod working. it works perfect when i use modloader, but if i use forge, this problem.

I would suggest a few things:

Make sure to use the *latest* forge (298 as of this moment).

Use NEI instead, it can create mob spawners for any livingentity's without needing to edit anything.

And always be sure to post a log, it might have something useful.

I also have the same problem; I also have NEI and the only spawner there is pig spawner.