This question may seem a bit long, but I try to give as much information as possible, since I am really staggered by this.
I am currently working an a
I suspect you have run into a known problem of categories embedded in static libraries.
If I am right, try to compile with the linker flags -ObjC (and if that is not enough, also -all_load) and your problem should disappear.
-ObjC
-all_load