Graphics messed up with guest additions in WinXP guest

[jepowelldds]

Running Virtual Box 3.2.2 on my 2.53 GHz Intel Core i5 MacBook Pro with 8 GB Ram; guest is a Win XP SP 3 box with a 10 GB virtual hard disk, 2572 MB RAM, 128 MB VRAM allocated to it. Settings have 2D and 3D video acceleration active but they don't seem to affect it,

I'm running a dental implant planning software called SimPlant from Materialise Dental, which views CT scan images and creates 3D volume renderings etc of them. Works perfectly fine when Guest Additions are not enabled, but when I turn it on (not the experimental 3D which I know does not work in OS X yet), it works fine until I try to zoom into any of the CT windows within the software (a feature in the software that takes one of the 4 small views and fills the screen with it), then the windows go completely unreadable with graphics that are a mish-mash of images in other small windows, meaningless lines and dots, and even portions of images from menus, cover art from iTunes and previously opened web pages from Safari on the Mac host!

It's as if the video ram is getting confused and getting part of it's info from the host's video ram. Strangely, MOST of the non-CT-viewing portions of the software, and everything else in the Windows guest OS work fine. Even more strangely (to me) is that the little window with the 3D rendering remains working perfectly fine, even if zoomed. It's only the 2D CT image windows that go haywire.

Happens every time, only with Guest Additions on, when I turn them off it works fine again. I assume it has something to do with open GL or something of that nature? Is this graphical stuff with guest additions still a work in progress for Leopard?

Thanks any/everyone!
Joel