Oh, OK... Well, if you were able to do it before then it's not a driver or compatibility issue. As for the 'Auto Play' function, that might be different on this tablet than it is on an iPad.
On this tablet you can go to "MY FILES" and you should see videos, images, music, etc. in different sections or you can select 'All' and browse to the SD Card reader (it should show up as an external memory drive).
Or you can also download a 3rd party File Explorer like ES File Explorer or Astro File Manager, but I don't think either of those can 'auto open' the card's content upon connecting.
Also, you SHOULD be able to see your pictures (at least after a few moments after you connect the reader) in your Gallery app.