I now see all topic responses in a hierarchical, tree view, and am at a loss as to how to change back to displaying all responses with the ability to navigate pages. Is this something that was changed site wide, or did I mess something up. I have been unable to modify the appearance in my control panel options.

On the upper right, under the 'New Topic Button' there is an 'Options' button, click that and then 'Standard Layout' you will be straight.

Yep, this happens every now and then and nobody seems to know why it does, but it's an easy fix.

You guys are the goods. All set now.