"cannot open output file" saving back to LRC

Upgraded to the latest version of Topaz and Gigapixel. When using the lightroom plugin it processes the file but wont save it back to lightroom and I get a “cannot open output file” error.

Works fine if I use the Raw editor though and only has this issue with the edit in Topaz AI option. I have 6GB VRam on my card and as the Raw editor send files back I dont think its a permissions issue as per previous threads.