Opera - a(nother) resizing question

I have installed the latest Opera package and mostly like it a lot and will probably switch to it from FF. The only thing I do not like much is that it fills the whole desktop and refuses to be resized (by dragging one edge of the window). I have seen a number of posts in these forums and in the wider world about a resizing issue with newer versions of Opera, but they mostly seem concerned with resizing images within Opera rather than resizing the whole browser window. I'm sure this must be possible: does anyone know how? If I need an extension, which one?
 
I've been using Opera a long time and have never heard of this issue. What window manager/desktop environment is this? Quickly the only thing I can think of is make sure that the window is not maximized when you try to resize.
 
Another long-time Opera user who never had this problem chiming in.

I suspect it's due to some odd behavior in your Window manager. Which WM do you use?
 
I suspect it's due to some odd behavior in your Window manager.

Thanks, I am sure you were right, because I seem to have solved the problem by switching wm. It was not resizing as I had already tried that (resizing to maximum made it fill the entire screen including the always-on-top menu bar, resizing back to normal made it fill the entire screen excluding the menu bar, but it could not be manually resized in either state). I was using Enlightenment when I experienced the problem. Switching to fvwm solved the problem and I have not been able to reproduce it as it now works in Enlightenment too.
 
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