I have a Rev A PB which has been working fine and I have been doing regular software updates when released.
I had not used the CF card slot for some time but now no media files are found (images, music, apps). The GUI sees the card but cannot find any files. It seemed to coincide with the 2.0.28 update.
Also, trying to do a firmware update via CF card does nothing. System just boots as usual without doing any update.
Haven't tried other cards (I don't have any others!) but all network functions, etc work properly.