Hey Bryan,
I haven’t seen this in several live sites. My guess is the program is stopping when it tries to display the school dropdown. So try the following.
1. Have you looked at the debug.log file? If you don’t have one (in wp-content) If not turn on WP debugging, reload that admin screen and see if you get anything. See any hints in there? If so, send it to me.
2. What version of WP and PHP are you running? See the WP requirements page.
3. Deactivate ALL other plugins, including any MSTW plugins other than LM and LM addons. Problem go away. (I doubt it, but if so you can turn the plugins back on one by one and isolate the conflict.)
Let me know.
-Mark