Does Xcelsius 2008 support circular references?

I have been using Xcelsius v4.5 for a long time now and just upgraded to 2008. Now, I can't do anything because circular references in my Excel files seem to be causing problems. Whenever I open a .xlf that uses an Excel file with a circular reference, the circular reference warning form Excel is showing. Normally, in Excel, this is fixed by allowing iterations, but I can not figure out how to change this setting through Xcelsius since the Excel menus are missing.

I sure hope circular references aren't going to be a problem because nearly every Excel file I create requires them.