SD Card not read after updated to Mountain Lion

Dears,

i've a real problem with my SD card and Mountain lion. since i've updated to the new OS and my memory card is hardly read! .. before updating, it was just enough to insert the memory card to be discoverable automatic on my Desktop and Finder...

Now, it's not seen at all neither on my Desktop nor Finder !

i've changed the card to another new one, but same problem! .. i've plugged it to a windows machine and it was read perfectly !!

Any help on that! .. why i'm facing those troubles since the update? how can i solve that

Thanks
Soha

fisherking said:

under Finder>Preferences...is "show hard disks" or "show external disks" checked?

Click to expand...

Yes it's shown

Unfortunately, unchecking and rechecking those options didn't help.
and the SD doesn't appear under the disk utility .. !

it's really driving me crazy why i can see it mounted at all !!