I just uploaded Beta 7h. I was hoping to include a fix for the stretched fish chart, but that may take a few more days. The only thing new in this version is Edgar's fix for the updating of non-primary screens. Maybe it will have some effect on Cliff's problem.
http://www.fish-byte.com/MA3Beta.zip
Regarding Cliff's problem, the only other thing I can think of is that possibly we are loading a dll or some other DirectX component, and it is remaining in memory after we exit. Windows does this a lot on purpose a lot these days, to speed up loading. I can visualize a case where MA loads a certain DirectX component, and DA might need a different version of that same file. But when DA loads, Windows sees what it thinks is the proper DirectX component already in memory, and uses that one. Rebooting flushes the RAM, and DA loads the proper file for its purposes. Just brainstorming...