I am having the following problem and one of the solution would be if I can enter the screen resolution manually.
System Hardware:
GIGABYTE RADEON X800 XL hooked up via DVI to Samsung SyncMaster 233SW at 1920 x 1080 and D-sub to a 17" Topcon monitor at 1280 x 1024
a onboard Nvidia GeForce 6150SE nForce430 which is not connected to anything and is disabled via Vista's Device Manager (nView and nVidia drivers have been previously installed)
Bios setting is setting PCI express VGA card as the primary
OS: Vista Ultimate 32bit with ATI Catalyst Version 09.3

Problem:
I mainly want to set each monitor to have different wallpapers that are from a specific folder and would change periodically. But Display fusion' wallpaper would not fill up the entire screen of the 1920 x 1080 monitor and the wallpaper that is supposed to be on display on the 1280 x 1024 monitor would span to the 1920 x 1080 screen.
The problem seems to be that Display fusion didn't get the correct screen resolution and hence the wallpaper it produced is not of the correct size

--- Machine ------------
Operating System: Microsoft Windows NT 6.0.6001 Service Pack 1
Operating System Version: 6.0.6001.65536
Detected Version: WindowsVista / 2008
CPU: x86
Date/Time (UTC): 03/29/2009 03:37:17
Date/Time (Local): 03/29/2009 04:37:17
.NET Framework: 2.0.50727.3074
CurrentCulture Name: English (United Kingdom)
CurrentCulture Code: en-GB
CurrentCulture Language: en
CurrentUICulture Name: English (United States)
CurrentUICulture Code: en-US
CurrentUICulture Language: en

--- DisplayFusion ------------
Name: DisplayFusion Pro v3.0.2
...
...

--- DisplayFusion x86 Hook DLL ------------
Path: C:\Program Files\DisplayFusion\DisplayFusionHookx86.dll
Name: DisplayFusion Hook
Prod Version: 1, 2, 0, 0
File Version: 1, 2, 0, 0
Size: 47,792 bytes

--- DisplayFusion x64 Hook DLL ------------
Path: C:\Program Files\DisplayFusion\DisplayFusionHookx64.dll
Name: DisplayFusion Hook
Prod Version: 1, 2, 0, 0
File Version: 1, 2, 0, 0
Size: 47,280 bytes

--- Taskbars ------------
Enabled: False
Count: 0

--- Screens ------------
Count: 2
Point Min X: 0
Point Min Y: 0
Point Max X: 2560
Point Max Y: 864
Total Width: 2560
Total Height: 864
ActiveDesktop: False

--- Screen 1------------
ScreenID: 0
Width: 1536 -----------------
Height: 864 -----------------
PosX: 0
PosY: 0
MoveH: 0
MoveV: 0

--- Screen 2------------
ScreenID: 1
Width: 1024 -----------------
Height: 819 -----------------
PosX: 1536
PosY: 0
MoveH: 0
MoveV: 0

--- Managed Threads ------------
Count: 1
ID:23 ~ NamerocessTaskbars ~ Age:00:00:01.1512935 ~ Alive:False ~ BG ~ State:Stopped

--- Taskbar Buttons ------------
Count: 0

So is it a known problem (with known fix)? I can't find any similar post in this forum. However, the same problem seems to affect another Dual screen background/wallpaper program John's Background Switcher too. So the problem is either there is something wrong with my system that send the wrong resolution info to wallpaper programs, or both wallpaper programs interpreted the information wrongly. But if there is no fix to the root of the problem, perhaps I can manually tell DisplayFusion the correct total resolution of my screens so that it generates the correct wallpaper?

Thanks!

Just to add that I have tried setting both monitors to the same 4:3 resolutions and tried checking and unchecking the "adjust to active desktop" option and the same problem still persist

Took me a while to figure out the root of the problem: I have the windows font size set as 120 DPI (and using Vista style scaling instead of XP style). A search of the forum revealed the solution:
http://www.binaryfortress.com/Forum/index.php?topic=537.0
May be Jon can make a installation note/warning/option/auto detection for that?