It has come to my attention that if you End Task on FH2 or for some reason FH2 does not shut down properly you can get an error upon restarting that says something about Failed to Move fh2/shaders_client.zip to bf2/shaders_client.zip.
The help above would have you redownload that file but really the only thing that happens is in your mods/fh folder you have to find shaders_client.zip.backup.
Delete .backup and your good to go!