this problem is killing me when ever i go to run my map after its compiled it gives me and error in call of duty 2 saying IWD sum/name mismatch if anyone could give me some help it would be great.

too many custom maps in your folder or too long names.

remove or rename to eg - 1.iwd, a.iwd, 2.iwd...etc etc.

they will still work.

Too many questions about this already:

You have 2 files in your iwd files which are named identically, but have different contents.
Extract all files from the custom iwdfiles and repack it into one.

My advice always move all custom map packs to a temp folder on your desktop while using radiant or testing your maps.... That way you wont get that error and you wont have radiant crash on you while your scrolling trough everybody elses custom textures... If you get this while playing on somebodies server usually it will give the file map pack name that you need to delete ie a.iwd delete this from your main folder and your golden.... Hope this helps