This happened today why my junior colleague was deploying customization on client machine, His chunk file was prompting to add code, code gets included but when log-in to GP and tried to access custom forms find nothing. He thought issue is with chunk file and recreated chunk file twice but no luck.
He asked me to help him out. So I check GP folder,custom dictionary was there, then I checked dynamics.set file but product information was not there and which makes me to look GP folder properties and what I found is that the GP folder was marked read only so Just unmarked the read only option and un-chunk the file again will solve the problem. 🙂