Hello!
Unfortunately i am having the same issue. I can not recreate the tabs as they are at the demo at my clean install!
I have triple-checked, tested different configurations but still i can not make it work.
For the record i have set the class as big, and nobg for the ID, but what i am having is renctacle borders with text-title at the "tabmix" mainbody. No images, no javascript. Links work.
The tab mainbodys seems to work ok but the background is transparent not white.
Also the white pointer does not exist.
Could anyone who managed to do it, just discride the 1-2-3 steps to reproduced it without error?
Thank you