What WindowBlinds does this happen with?

Are the windows min or max?

Do you just need to use the monitor controls an adjust the screen up?

Thanks for such a quick reply.

It's happened with all the WindowBlinds I've tested it with, but not with Windows Classic or the XP default style.

It only seems to happen with windows that aren't maximised, and it's not a monitor issue as turning off WindowBlinds or resizing the window will fix the problem. It's annoying however to have to do this for nearly every window.

Have you adjusted any setting on the computer, like DPI?

Nope, it's at the default 96 dpi. I haven't changed any other settings either.

Hmm, this is interesting.

Go into WindowBlinds and copy and paste the system info here.  Maybe that might show something that could be the problem.

Is this what you were referring to:

WindowBlinds version : WindowBlinds 7.01 (build 83 x86)

WindowBlinds is installed correctly on this PC
WindowBlinds appears to be activated on this PC
Your machine supports per pixel borders on WindowBlinds skins.

(Plug and Play Monitor) 1 is attached to NVIDIA GeForce 8500 GT

Wblind.dll         2010/02/09 14:32:20
Wbsrv.dll         2010/02/03 16:11:56
SevenConfig.exe         2010/02/15 14:09:57
Wbload.exe         2010/02/02 14:33:18
Wbhelp.dll         2008/04/28 10:35:07
Wbui.dll         2008/04/28 10:35:05
Tray.dll              2009/10/21 14:13:19
Screen.exe         2009/12/03 13:43:26

I've had this happen after applying a new skin. For me, a reboot (or reverting to the skin I started with) has always cleared up the problem.

I was thinking that it may have been a problem  with per pixel borders.

Try what Lantec suggests.

A reboot didn't work for some reason, but I also disabled per pixel bordersm and that seems to have fixed the problem.

Ahhh, given time we would have suggested that. 

Glad to see you have it working.

Hehe, thanks for the help .

Are the drivers or your graphics card up to date; a 8500 GT should not have problems with per pixel frames. My card is a Radeon 9200 SE, which is a much lesser card than yours. I very rarely have this issue and normally revert to last skin then reapply skin I want to use clears the issue up.