Does it Work Standalone?
Did you do another reset and rescan after you moved the dll?
On my machine the Multi-samples etc appear to be installed here C:\Program Files\Cakewalk\Dimension Pro
The Dll and the exe are installed here C:\Program Files\Cakewalk\Vstplugins\Dimension Pro
I would also check the registry to see if it has register properly and is installed where the machine thinks it is.
May be better to just add the path in the plugin manager then to move the dll.