YES! Yes to the black screen AND a hidden file! I have the EXACT SAME THING - I posted recently about BOTH issues in this thread (my posts start about halfway down):
http://yabb.jriver.com/interact/index.php?board=2;action=display;threadid=17304Although it opens on my screen okay, it opens on another user's screen EXACTLY as you describe - black, weird-looking, unusable, unnavigatable. So he can't use it, period. I finally just gave up trying to solve it, it was making me absolutely crazy.
Also, if you continue reading my posts on that thread, I write about a "hidden file" that never deletes, because despite repeated uninstalls/fresh downloads/reinstalls, my full name and license # appear in the software automatically. It IS leaving something on our computers and I think it's also linked to the black screen problem.
I did not ever use the MJ uninstall, always through Windows. Because MS always says use Windows to remove programs. I have really given up but at least glad to know I am NOT going soft in the head - no one here knew what I meant by the "black screen".
It's definitely worth pursuing, but other than coming here to ask, what can we do? I paid for a license and now the person (the other user) who is the person who REALLY wanted to use it, cannot do so.