I am running PhotoMechanic ver. 4.4.3.3 with Windows XP. Interestingly, if I go to the folder level on the CF card, there is no problem. I don't think I made it clear in my initial message that this is an occasional problem and doesn't happen every time. I had zero problems with Lexar 80x card. Perhaps the Write Acceleration Technology or the speed has something to do with it. I found out that the 133x card is not compatible with my Epson P 2000, just a thought.
Thanks,
E. Unger