Tooltips are no longer displayed upon mousing-over a unit.

This is an layout issue.

How so? I had it working fine before oUF 1.5.

Because oUF itself doesn't do anything with unit tooltips. This is fully implemented within the layout.

How did I have tooltips prior to this then? What do I need to add to get them back? Is there a layout that adds them that I should look at to see how its done? I can't find any code examples that mention anything about tooltips.

I found an example. It works now.