Memory card - 0 used, 0 available??

I'll admit, I'm totally new to the whole using a memory card in the phone thing.  I read the instructions for inserting/removing the card and have that downpat.  I formatted the card once inserted.  But now when I check the memory, it states there are 0 used and 0 available.  When I try to move a pic over to the memory card, it states there is not enough space.  I just noticed this and don't have the card reader with me to test the memory card in my laptop.  But any ideas as to what gives?  Am I doing something totally wrong?  Is it the card??  I bought it off of eBay and it is a Sandisk (came new in packaging with English writing) came from Hong Kong - bad idea??  Any help, feedback, etc is much appreciated!

Oh!  It's also "locked" my phone up a couple of times - just for a second or two - but the touchscreen becomes completely unresponsive (and it's only done this since I inserted the card).