Iso file issue

I have about 100 DVDs ripped using DVD FAB and have loaded the iso files on the hub over the last month - working great - this week I do 5 more the same way and the hub throws me an error message saying file type not supported see manual - the others still work fine it is just the 5 this week. I tried ripping them again and reloading with the same issue - any thoughts?

Have you tried playing the ISO file that doesn’t work on the hub on your PC?