Welcome, pd32!
Sorry to hear your having a problem. I like DAMM a lot and have been using it for almost a year now.
First thing I'd do is check and re-set all the paths to the various DA elements that DAMM uses.
They are set from the "Options" tab, the last one on the right. (I didn't highlight it because this screenshot was originally for a different purpose.)

Open that, and select each of the items, re-designating the paths manually (even if it's to the exact same location.)
If that doesn't do it, then I'd uniinstall/re-install DAMM itself.
Let us know if you get it sorted.