I'm back onto this one again.
In answer to your questions above:
DW Version 12 Build 5808
Windows 7 Pro
Downloaded and installed extensions again today.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.