That's odd, I've never seen that problem. Your DVD player should just be in 16:9 mode all the time if you have a 16:9 television. That could be related to the problem with the other movies.

I recommend asking this question in the DVD hardware forums at www.hometheaterspot.com which is a BBS almost as useful as this one is. Make sure to give them your make and model of DVD player and TV, and tell them what input on the TV you are using to hook up the DVD player. Also make sure to mention the thing about AVIA since that's the first thing they'll ask.

They'll get you sorted out