Catalyst v5 and CITP

I am having issues getting thumbnails to show up from Catalyst v5.02 n546 to a hog 4 running 3.1.0

When I refresh Media and check the Media Status I see the file names of all the thumbnails copying & downloading and then it states "No valid URL for Catalyst Folder ## thumbnail" (## being the folder number)

Is there a workaround for this, I rely on the media quite heavily for this show and it is doubling my programming time.

Thanks
Ben