This may sound silly, but perhaps the card has too much memory for the computer to read. My wife's computer doesn't have an SD card slot so she tried to use an old hard wired (USB) card reader. It wouldn't "read" the 8 gig card but it did read a 1 gig and 4 gig card. The 8 gig read fine in mine. She wanted the photos so I down loaded them from her card to a CD, her computer has a cd/dvd reader. That was an hour I'll never get back.
Anyway, your computer may not read a 32 gig card. There are still some cameras in use that take a max of 8 gig card so it stands to reason, to me anyway, there are readers that will only read up to 8 gig cards.