Just wanted to take the time to say that you have the best plug-in and support. I admin of a farily large Multi-site WordPress instance and it's worked out really well. The other tab plug-in I tried rendered our search inoperable, so I had to remove it.
I did have a small isuue with the .css, but looking through what others had posted and your response I was able to figure out the problem myself.
Right now we are using one of the skins that's included, but will be creating a custom .css and your instructions on the FAQ page will come in handy.