It just happened to me. I was suddently unable to open a trackview anymore. Instead of deleting the 3dsmax.ini - once more - I decided to give maxscript a try and search for applicable functions... It's very straightforward - and will delete all the trackviews opened in your maxscene - and hopefully - the one that are opening outside of your screen...
Will simply erase all the closed or invisible trackview instances it will find. Usefull when you can't open your trackviews anymore. Worked for me. :)
Launch it from the max menu. There's no interface provided - it's pretty useless.