AutoCAD DesignCenter is not showing the correct icons (thumbnails) for drawings in our block library.
If a drawing is renamed the correct icon is shown, however when the name is put back to the original the icon is also reverted. AutoCAD must be caching the thumbnails, it used to put them in a *.cdc file in the folder - this could be deleted and then DesignCenter would rebuild it. Now it doesn't use that file and in fact if one exists when I choose 'Refresh' from the context menu the old file is deleted.
I have even tried creating an empty *.cdc file to see if that would force a refresh, but the file is deleted and the incorrect icon remains.
Any ideas?