Well downloaded new version and that works OK.
Might be an idea to have the plugin re-create the folder if it doesn't exist rather than just not cache the images.
Yes, seeing as it the folder(s) are stuck in MyDocuments as opposed to Local Settings\Application Data where the other CF files are, will mean those folders will be missed if an installation is copied.
Sorry about the rant about My Documents, it's just a spin off from the argument I am having with MitchJs over his plans for RideRunner /RoadRunner plugin storage locations.