Psscontrol2.exe sucks for loading smartshaders quite simply. I recommend doing it with omegadrivers which would give you more performance anyway.
www.omegadrivers.netFirst thing to look for is make sure you don't have any other smartshaders loaded in the CCC when you try to load hdrish with psscontrol2.exe, another thing is make sure you have dx9c installed(you probably do...wouldn't hurt to check...if i'm right dx8.1 you can still play fs2).
Hdrish and a bunch of other smartshaders are dx9 dependent and shader module 2.0 or higher dependent, which the radeon 9800 pro is compliant in those areas as opposed to something like the radeon 9250 which is dx8.1 compliant and not shader module 2.0 compliant.
I'm a previous 9800pro owner anyway, so i know you can get this working. Another thing is make sure you're not playing fs2 in directx. Play fs2 in opengl as some smartshaders don't work in directx games(another possible hinderance to you if you're playing fs2 in directx for some reason or not knowing that you are).
If hdrish still doesn't work for you after that, try reinstalling the drivers and then doing psscontrol2.exe with hdrish as that would certainly be messing around with a new install of catalysts. Make sure you have the newest version of catalysts(same thing if you use the omega's). I recommend the omega's though, it's easier to implement other smartshaders that didn't come with the drivers without using another program to do it like psscontrol2.exe.