Quote: Try to re-install 3dgs shell extensions again. 3dgsse Installer have to fix it, I hope. In the next update I'll do special option to fix this issue without reinstallation. [edit] it is funny... trying to reproduce your issue. My installed copy of lite-c wan't uninstall properly (manual, and some files still alive). So, just reinstall 3dgs se to fix this.
I managed to figure it out just hadnt had time to post yet. I just manually delte any files left after a uninstall. However I can shake the funny icon it now assocites with .mdls ....
but thats another issue as when I'm in thumbnail it all works ok now since I re-installed your viewer.