How do you get pictures to upload full size and not as an attached thumbnail?
Also I can't seem to open thumbnails. screen goes dark but picture doesn't open

 

I'm not sure if this will help but in your User CP tab and Edit Options, there's an Image Sizer. I know mine are blank. You might check that. If that's not it, I don't know.

If it matters...and it doesn't, I never figured out how to get thumbnail pictures.

 

Check your user CP/Edit Options/Visible Post Elements

Look foor the text below and put a tick in each box.

You have the option to show or hide various elements of messages, which may be of use to users on slow internet connections, or who want to remove extraneous clutter from posts.
Show Signatures
Show Avatars
Show Images (including attached images and images in [IMG] code)