So far, the most pressing issue is that it is extra work to see if I have a PM. Which could be simply a compliment, or more urgent like a request for material or something from administration (which I might otherwise miss, allowing a minor issue to become a major one). Then the statistics (I like to see poster ranks in order of how many posts they have in certain time frames).
One thing that needs attention is that some of the icons do not work well. I tried changing the color of the text, and that does not work properly. And there is a lag between backspacing several times and the time it takes effect, which could lead to backspacing past the error and erasing wanted text. Still, these are bugs that need attention as they arise--the other site had most of those bugs already fixed.