Good morning Ducsters!

I haven't posted in a while. I've been busy trying to learn the mysteries of ProTools. This isn't a big deal but it's really starting to aggravate me. Every time I open a session I have to resize, (click & drag ) the edit and mix screen borders to fill the screen. I use one monitor and select each as needed. I have tried all the options in the Window button, (cascade vertical, horizontal, etc.) but nothing changes. Is this a ProTools set up problem or a Windows problem? Like I said, not a work stopper, just an aggravation! Thanks.