This may seem odd but this happens to me a lot...
I'm using a web browser and decide to move it out the way and when I let go of the left mouse button the window is positioned in such a way that the bar at the top completely covers the bar on the window
in other words I can no longer drag the window because the window bar is behind the ubuntu screen bar for the app
I can't move it, I can't resize it... ugh. I can not believe someone designed it this way. they should of prevented you moving the window so that the bar is 100% covered so you can still click on it and bring it back.
So how do I move this window now?