I have confirmed today with R&D that Sandisk Extreme and Extreme Pro (60MB/s and 90MB/s) of up to 64GB were tested and are compatible with the Aptus-II series.
Might be an issue with you specific back (although you say it work with your other cards) or with that specific card. Do you have any way to test it with another 32GB card?
Failing that I would suggest contacting your dealer, opening a case and following it up from there.
BR
Yair