It's a little hard to believe after all this time, but I just discovered a new (and fairly serious I think) Tag Window deficiency. Since I've now switched over almost entirely to MC12 (including my HTPC) I've been forced to battle my way through using the new Tag AW on occasion (ugh). I still use MC11.1 when I have to do real work (or more often just put it off), but every so often I need to jump in there.
And so, I've discovered that I can't use it at all on my HTPC. Because it's only monitor is a large standard def TV I have Windows' large fonts option enabled, and I also very slightly bumped up the size of MC's fonts (under Tools --> Options -->Tree & View --> Select Font I have it set to Size = 11).
So anyway... The Tag AW is all messed up. The Tag AW "header" (the part of it where it lists the file's Name, picture, date, type, size, length, rating , and last played date at the top before it switches to "alphabetical mode") overlaps the tag in the first "alphabetized" field below. So, when I go to modify the "Artist" I have no idea if I'm clicking on artist or the rating (since they overlap). I'll try to post a screenie of it later (I can't now because my wife is using the Photoshop computer for homework right now).
Either way... I would understand if I had pumped up the fonts by a large amount, but my change was very modest (and works fine everywhere else in MC12 and everywhere in MC11). These "header" items need to make sure to push the "alphabetical" items down based on the actual, selected font size not based on an arbitrary fixed size.