Tricod 5.6" Digital frame - only first 142 files?

Hi folks,

Got a Tricod (http://www.tricodinc.com) 5.6" digital picture frame.
Got a 512MB SD card to go with it. I put about 700 pictures on the
card.

WHen I put it in the frame - it only sees the first 142 files. Check
the SD card - they're all on there.

Anyone used one of these before? Is there a limit on an SD card? Is
there a limit on the frame? Or could it be that since I didn't resize
my pictures to 640x480 (the frame's native resolution) that it won't go
any further? I'm going to try resizing them all and see what happens,
but curious if anyone has seen this behavior on this frame or others
like it.

--*Rob