First, you need to open the add-in file and turn the menu back on. It sounds like there was an issue at some point in loading the SF assemblies when launching the VS environment. Open the following file:C:\Documents and Settings\YourUserName\Application Data\Microsoft\MSEnvShared\AddIns\StrataFrame.AddIn
Make sure the LoadBehavior tag has a 1 in it. Also, if the file name has been renamed to something other than StrataFrame.AddIn be sure to name it back.
As for your DDT license, you may just need to de-activate and re-activate. The licensing did change between 1.5 and 1.6 so you may need to re-activate if the problem persists.