Unable to change XP res higher than 1440x937

[brewmanz]

Top menu View has all 5 view options available, and Auto-Resize(Host+G) checked.
Win screen res is fixed(well, max) at 1440x937. When I drag window to increase size, I get a white border. If I use full screen (Host+F) I get a black border, and Host+F again does *not* switch out of Full Screen - it tells me it's switching to Full Screen ... again. Clicking window icon on bottom hiding toolbar gets out of full screen.
At this point, View menu has 'seamless' & 'Auto-resize greyed out (but Auto-resize still checked).

How do I get a larger(wider) window for WinXP?
I have tried dragging larger window, and restarting WinXP. It just resizes itself to 1440x937 when it starts up.
WinXP - Desktop right click - Settings show VirtualBox Graphics Adapter, Screen Res options of 800x600, 1024x768, 1152x864, 1280x960 & 1440x937
Adapter Details are Type = "VirtualBox Graphics Adapter", Mem = 32MB, BIOS= "Version 0xB0C2 or later"

I'm running XPP SP3(32bit) under VB 4.1.16.78094 under Ubuntu 11.10(64bit) on an HP Compaq6715b (AMD Turion 64 X2) with 4GB RAM & Gallium 0.4 on ATI RS690.
Native screen res is 1680x1050.
VB VM is 1536MB, PIIX3, IO APIC, twin processor with both H/W virtualisation checked.
VM Display is 32MB RAM, 1 monitor & no 2D/3D accelerators.

Note that I recently uninstalled older VB (4.1.6 maybe?) but had problems even before then. In fact, since starting to use it over 6 months ago or so, it has rarely behaved properly, and problems fixed here have re-appeared again shortly afterwards.

Log is attached.

Thank you for any assistance you can give.

[brewmanz]

*STOP PRESS*
A) Exiting FullScreen mode via clicking Windowing icon on bottom hiding menubar does not always work. I went over my steps again, and could only exit full screen mode via Host+A resize option.
B) It seems to have *two* full screen options - initial one that's truly full screen, and then Host+F toggles second type of pseudo-full screen - it has top menu bar *without* windowing options and moving mouse off left of screen causes Ubuntu menu bar to appear

[brewmanz]

Well, I've fixed it myself.
As I rummaged through the installed apps, I noticed a VMWare(am I allowed to mention that here?!) client app from 4 months ago (I planned on moving this VM to a VMWare server .. until I discovered that it required Windows clients!)
I uninstalled the VMWare client app (which it never did officially, getting stuck with '1 second to go' for an hour, so cancelled).
Then I rebooted. VMWare client has gone, and I can now resize VM Window - YAY!