Now, I just was traveling on vacation I hooked a drive and it's not locating the catalogs. I'm getting the question mark for all previews. ???
One possible cause of this happening (which I think is the most likely explanation) is that when you plugged in the drive, the letter of the drive is not what it was previously. Please check to see what letter Windows assigned the drive, and if its not the letter that was assigned previously, change the drive letter.