Sorry to bring this up again but I'm having a problem with my Popcorn

Some of the park videos I had were now on DVDs. I though I'd rip them back to the PC and transfer them to my dedicated HDD drive to play through the Popcorn A-100 on my TV.
They were ripped to video_ts files (VOB BUP and IFO) in folders with the video name on it (eg Splash mountain). Also the empty audio folder is in there as well, of course.
Trouble is, the A-100 sees the folder but reports it as 0kb on use of the info button. It doesn't open so I can select the video_ts folder or anything, just reverts to the splash screen with the "backup your hard drive" reminder.
I've already checked there are no "extra" files in there that may cause problems.
The A-100 is supposed to play vob files but I'm stumped.
Any suggestions from those of you that have this media player would be welcome.
Thanks.