Hi Jon, first bug, this one has been around for a while under Win 7 RC. As you can see if the secondary task bar is turned on (RH screen) and one spans a window across both screens then the window becomes out of step.

Hmm on the desktop the background are aligned but the spanning window is not. But the capture shows it the other way around. Weird.

Yeah that is a problem with the screen capture software. Okay got the camera out, can you see the issue now?

In fact it you look at the original screen shot and lie up the wallpapers that is what is seem in actuality, i.e. the black bits seen on the top and bottom of each wallpaper are not really there that marks the desktop edge, so if you take both images and slide them up / down to get rid of the black bits which of course then shows the misalignment I refer to. The split and slide needs to be done around the centre split line of the two monitors.

Difficult to explain but I hope the photos show what I mean.

Hmm it may be a Windows 7 bug as I've just exited DF and the issue i still there

Both are HP LP2475W monitors and set to the exact same resolution : 1920 x 1200 ..... weird or what! Both DPI settings are exactly the same too!

The thing that comes to mind: in Windows, look for the following option. (Attached screenshot). Are your monitors lined up in that? Because it looks like to me they are not.

And if they are, do you center your wallpapers in DFP? Under the tab 'position' is everything set to '0'? (Just a guess).

See attached screen shot in your windows settings (right click desktop screen resolution). This is probably what you'll see. This is why your windows split vertically when you drag them across the two monitors. Scoot the right one even with the left and you'll be all set.

Well slap me around the face with a damp squib!

That has indeed sorted the issue, I'd never realised that the positions of the screens in the config option could be moved around!

Now moves side by side and the problem is indeed gone.

One very happy man here now!