Oddly enough, after I went about trying to format my SD card in my iMac, the card slot no longer reads any card. It's strange, and pretty frustrating. That doesn't help you, but I was able to do it.
This is what they sent to me:
"Please replace the stock 8GB card with your new 32GB card. In order to do this, open the back of the Infinity with a Philips head screw driver and simply remove the SD card and put in the new one. In order to remove the SD card please place your thumb over the entire silver casing and slide it to the left (toward the input jacks), then lift up the entire card and housing. Then place the new card, and make sure that it is seated properly.
Download and install the latest version of the application. When you run it, it will see that there are no connected Infinity's and then scan your computer to see if there is one with an un-formatted SD Card. A pop-up will then appear, select the SD Card you want to format from the list and click Reformat. You'll have to input your computers password twice and then the Infinity will begin reformatting which can take ~5 minutes.
Two caveats: 1) The Name of the SD Card cannot have any spaces in it. 2) The SD Card must be in the Infinity for this process. Place the SD Card into the Infinity, then connect the Infinity to your computer using the USB Cable. Then run the application.
Regards,
Alex"