I've never had trouble with reading cards on my Mac either, but I've read of many people who have. And my ipad is a nightmare with Fuji cams - the first couple of times I uploaded to my ipad with my X100 I thought my camera had died it took so long to start up. X10 and X-Pro do the same. So its now just a matter of routine that I don't ever upload my files without then immediately doing a reformat after I turn the camera back on. And I turn it on and reformat it THEN, so I don't get a rude surprise/delay out in the field the next day. But that's pretty much always my process with any camera - I reformat as soon as I upload. Having images on my computer (or ipad) and leaving them on a card can only result in confusion and I don't need any MORE of that!
-Ray