Horde/imp anyone using it please read.

Ok i've got horde and imp in place on my systems. While going throught he configuration and setting things up I've noticed that in many places after an echo statement or printf or sprintf the () if preceided by a _ which produces an error for me. I can go through and take out all the _'s but I wanted to know if they were supposed to be there and perhaps I've configured php incorrectly. FYI: I am using php for several other things and it works properly. Thanks, Michael