AS 1.9.1
DNN 5.4.4
Not an AS upgrade issue
Using defaults for styles, etc.

I am attempting to hook up a group to a forum in order to make the Group Discussions tab work.  However, when I go to the control panel for the group, I can see the list of forums in the drop down but selecting any of them does not fill in the selection in the drop down and thus no Save can be done.  It's strange that they are visible but clicking on one doesn't select it.

Same issue