Title bar buttons are still visible when you put WMP 12 in to full screen mode. The buttons are positioned at the last place you had them on your screen. So if I full screen mode with the player title bar in the middle of the screen the title bar buttons will remain there.

I have tried this from Skin mode and Now Playing mode and they both produce the same error.

I am running Windows 7 Ultimate Build 7600.

I just enabled Title bar buttons and created a single button, and then opened WiMP and tried this - I cannot reproduce this at all. So, there has to be a reason it is doing it on your machine and not mine.

For Jon's sake, can you post the DF error log (from the troubleshooting 'tab' on the Settings page for DF) and paste it here either as an attachment or inline in your post?

--- Machine ------------
Operating System: Microsoft Windows NT 6.1.7600.0
Operating System Version: 6.1.7600.0
Detected Version: Windows7
CPU: x64
Date/Time (UTC): 09/09/2009 05:36:29
Date/Time (Local): 09/08/2009 22:36:29
.NET Framework: 2.0.50727.4927
CurrentCulture: English (United States) (en-US ~ en)
CurrentUICulture: English (United States) (en-US ~ en)

--- Wallpaper ------------
Wallpaper Span: False
Windows Wallpaper: C:\Users\markv\AppData\Roaming\Microsoft\Windows\Themes\TranscodedWallpaper.jpg (Exists: True)
Generated Wallpaper Folder: C:\Users\markv\AppData\Roaming\DisplayFusion

--- DisplayFusion ------------
Name: DisplayFusion Pro v3.1.2
Build Date: Sep 03, 2009 22:06
Command Line: "C:\Program Files (x86)\DisplayFusion\DisplayFusion.exe"
Current Folder: C:\Program Files (x86)\DisplayFusion
Performance Mode: False
Mouse Hooks: True
Application Hooks: True
System Hooks Pause FullScreen: False
Process Integrity Level: High

--- DisplayFusion x86 Hook DLL ------------
Path: C:\Program Files (x86)\DisplayFusion\DisplayFusionHookx86.dll
Name: DisplayFusion Hook
Prod Version: 1, 8, 0, 0
File Version: 1, 8, 0, 0
Size: 48,304 bytes

--- DisplayFusion x64 Hook DLL ------------
Path: C:\Program Files (x86)\DisplayFusion\DisplayFusionHookx64.dll
Name: DisplayFusion Hook
Prod Version: 1, 8, 0, 0
File Version: 1, 8, 0, 0
Size: 60,592 bytes

--- DisplayFusion x86 Hook Exe ------------
Path: C:\Program Files (x86)\DisplayFusion\DisplayFusionHookx86.exe
Name: DisplayFusion Hook x86
Prod Version: 1, 2, 0, 0
File Version: 1, 2, 0, 0
Size: 92,848 bytes

--- Monitor 1 (Primary:True ~ Real:True) ------------
Name: \\.\DISPLAY1
Bounds: {X=0,Y=0,Width=1680,Height=1050}
WorkArea: {X=0,Y=0,Width=1680,Height=1010}

--- Monitor 2 (Primary:False ~ Real:True) ------------
Name: \\.\DISPLAY2
Bounds: {X=-1360,Y=0,Width=1360,Height=768}
WorkArea: {X=-1360,Y=0,Width=1360,Height=728}

--- Screens ------------
Count: 2
Point Min X: -1360
Point Min Y: 0
Point Max X: 1680
Point Max Y: 1050
Total Width: 3040
Total Height: 1050
ActiveDesktop: False

--- Screen 1------------
ScreenID: 0
Device: \\.\DISPLAY1
Bounds: {X=0,Y=0,Width=1680,Height=1050}
MoveH: 0
MoveV: 0

--- Screen 2------------
ScreenID: 1
Device: \\.\DISPLAY2
Bounds: {X=-1360,Y=0,Width=1360,Height=768}
MoveH: 0
MoveV: 0

--- Managed Threads ------------
Count: 4
ID:4 ~ Name:HookManager ~ Age:11:57:07.8080498 ~ Alive:True ~ BG:True ~ State:Background ~ Thread Name:HookManager_3d95065e-bc49-4240-8bbc-e3e6c47d2d03
ID:6 ~ Name:HookManagerProcess ~ Age:11:57:07.7160446 ~ Alive:True ~ BG:True ~ State:Background ~ Thread Name:HookManagerProcess_873ed025-3973-436d-9035-5ed369060bb1
ID:7 ~ Name:TaskbarManager ~ Age:11:54:28.2509237 ~ Alive:True ~ BG:True ~ State:Background ~ Thread Name:TaskbarManager_5d99bd9b-c1c3-431b-a258-36e7faaa268a
ID:20 ~ Name:TitleBarManager ~ Age:11:49:27.2097051 ~ Alive:True ~ BG:True ~ State:Background ~ Thread Name:TitleBarManager_1ac73abd-c27a-4f47-8cda-13f34ddbbdd8

--- Taskbars ------------
Enabled: True
Auto-hide: False
Visual Styles: True
Visual Styles Detected: True
DWM Composition Detected: True
Opacity: 100
Flash Blink: False
Window Options: ShowRelevant
Button Width Max: 160
Sizing Bar Size: 0
Full Screen: 00060bb6 ~ {X=-1360,Y=0,Width=1360,Height=768} ~ "WMPTransition", 00190a02 ~ {X=0,Y=0,Width=1680,Height=1050} ~ "World of Warcraft"
Count: 1

--- Taskbar 1------------
Location: {X=0,Y=1010,Width=1680,Height=40}
Monitor ID: 1
Position (Setting/Current): Automatic / Bottom
TopMost: True
Buttons (2):
"World of Warcraft" (00190a02:00190a02:00190a02 ~ Unknown ~ None ~ {X=0,Y=0,Width=1680,Height=1050})
"DisplayFusion Pro ~ Settings" (00040bc4:00040bc4:00040bc4 ~ Icon_Big ~ None ~ {X=464,Y=254,Width=751,Height=501})

--- Deleted Items (2)------------
00190a02:00190a02:00190a02
00040bc4:00040bc4:00040bc4

--- Taskbar Items ------------
"Windows Media Player" (0008030c:0008030c:0008030c ~ None ~ {X=-953,Y=60,Width=320,Height=274})
"DisplayFusion Pro ~ Settings" (00040bc4:00040bc4:00040bc4 ~ None ~ {X=464,Y=254,Width=751,Height=501})
"World of Warcraft" (00190a02:00190a02:00190a02 ~ None ~ {X=0,Y=0,Width=1680,Height=1050})
"A G O N Y :: Index - Mozilla Firefox" (00050806:00050806:00050806 ~ None ~ {X=-1360,Y=0,Width=1058,Height=728})
"BBC's Survivors season 1" (00130952:00130952:00130952 ~ None ~ {X=-1260,Y=0,Width=1260,Height=728})
"Sent Items - Microsoft Outlook" (000a05ca:000a05ca:000a05ca ~ None ~ {X=-1368,Y=-8,Width=1376,Height=744})
"Ventrilo" (001f0a9c:001f0a9c:001f0a9c ~ None ~ {X=-333,Y=2,Width=327,Height=728})

--- TitleBar Buttons ------------
Enabled: True
DisplayFusion Caption Button Size: {Width=35, Height=21}
System Caption Button Size: {Width=35, Height=21}
Count: 6
"A G O N Y :: Index - Mozilla Firefox" (00050806 ~ {X=-1360,Y=0,Width=1058,Height=728} ~ {X=-536,Y=0,Width=109,Height=20} ~ Visible:False ~ Process86)
"Ventrilo" (001f0a9c ~ {X=-333,Y=2,Width=327,Height=728} ~ {X=-240,Y=2,Width=109,Height=20} ~ Visible:False ~ Process64)
"Sent Items - Microsoft Outlook" (000a05ca ~ {X=-1368,Y=-8,Width=1376,Height=744} ~ {X=-230,Y=-2,Width=109,Height=20} ~ Visible:False ~ Process86)
"BBC's Survivors season 1" (00130952 ~ {X=-1260,Y=0,Width=1260,Height=728} ~ {X=-234,Y=0,Width=109,Height=20} ~ Visible:False ~ Process64)
"Windows Media Player" (0008030c ~ {X=-953,Y=60,Width=320,Height=274} ~ {X=-867,Y=60,Width=109,Height=20} ~ Visible:True ~ Process86)
"DisplayFusion Pro ~ Settings" (00040bc4 ~ {X=459,Y=249,Width=761,Height=511} ~ {X=1037,Y=249,Width=109,Height=20} ~ Visible:True ~ Process64)

Its because of the way that wmp is handling its own FS.