Connect X6 thumbnails not displaying

I know this has been covered before but I still can't get Connect to display all previews of files. It will show some folders of clipart okay, but a lot of them just shows icons. It looks like the images start to display and then snaps back to an icon.

I have made sure all shell extensions have been removed and then installed the one form the X6 DVD, and made sure CDR files are associated with Draw X6.

Any ideas? Draw version is 16.1.0.843