Do you have the CS5 Extension Manager installed? CS5 is not the same as CS5.5 or CS6.
Thanks Nancy, it is installed however I just installed Cs5.5 which opens separately from the tool in the DW Extension Manager tab. It's now saying I need DW 6 installed to add my older apps. Sigh. As I mentioned, it all works fine on my other computer. I think I'll call tech support tomorrow but I was curious if anyone else is running into this problem. Don't really need to or want to upgrade at this point.