Thanks, all.  I did what I did with Poser 5 and Poser 6, and it seems to have worked!

I don't block Poser, because you take a resource hit when you do that.  If you let it do its network check thing, it checks once each time you start Poser, and that's it.  If you block it, it keeps checking, and checking, and checking.  Every time you do anything - click on a menu item, the library, etc. - it tries again. 

The tab is just very inconveniently placed for me.  It's right beside/under the library palette, and I'm constantly clicking on it when I mean to click on the library. Even if the Internet is blocked, it's a pain.