The USB port still works fine, I tried both of my back-up HDDs and yeah, both ports still seem to be working.
Unfortunately I don’t have a camera on me to test the cards (I rent), but I will certainly give it a try. Like I said, it still gets picked up when the reader is used with a SONY VAIO laptop running Windows7. The cards and reader both seem to work, just not with my Macbook anymore.