Hi Joe, we've come across a strange situation in testing, and I can reproduce it on the demo site. Using an Artisteer 3 skin (I tested with Artisteer-30headermenu), if you are on a page with three colums, the right column is shifted outside the page when viewing it in IE7 (or IE7 browser mode in the IE9 F12 developer page).
I did some investigating using the straight exported HTML page from Artisteer, and it seems that as long as JavaScript is enabled, the three columns work right in IE7, but if scripts are blocked for any reason, the right column is outside the page. I put in a case with Artisteer, saying that the basic page layout shouldn't rely on JavaScript to look right. Their response was that most websites would look terrible with JavaScript disabled anyway, so I think they are washing their hands of it, although I did ask them specifically if their position is that JavaScript is required for the layout to look right in IE7, and I'll let you know what they say.
My theory is that mojoPortal is somehow interfering with the Artisteer JavaScript IE7 fix. Can you take a look at this when you get a chance? It's going to hold up our Library site deployment, since there are some workstations with IE7 there at the library (don't ask). I did some research and it looks like IE7 still has 8% of the browser market share, so unfortunately it's not a trivial number.
Thanks!
Jamie