TBStudio 4 not able to save after install on Windows 7

I have ToonBoom Studio 4 ( Build 4. 0 . 9946 ). I Recently installed Windows 7 onto my new computer and re-installed ToonBoom Studio 4.
All Good! After transferring my animation projects TBS4 would load a project but when I tried to save it ( or Save As ) I got a message telling me that I could not save to the location it was loaded from.
My computer is set up to install software to C: drive and all my saved files are on D: drive. I would have thought that If TBS4 knew where to get the file
it would be able to save it?? Can you help?
Cheers
2DFrooty

Turn off UAC