I have reset your signature--the allowable sig dimensions are 50x5 to 250x25 pixels.
Just testing my new sig...
Dang. I wanted to be used in all maps. I just assumed since the antlions always followed you in HL2 after you got bugbait, it was only a Weapon thing.
I believe the reason pheropods don't work right is because the maps aren't made so they work right. You have to have a node in the map that tells the Antlions that bugbait should or shouldn't work. Edit the maps you want to use it in and it will work.