Display fuxored shortly after making with VPN connection

[NoMojoMofo]

I get about 10 minutes use of the VPN connection and then the whole VBox window goes to about 100px high and turns mostly maroon.

Issuing an acpi shutdown closes the vm down immediately.

VBox-1.5.6
Host: Ubuntu 7.10
Guest: WinXP sp2

Log says:

00:01:34.790 Display::handleDisplayResize(): uScreenId = 0, pvVRAM=b2594000 w=1584 h=1118 bpp=16 cbLine=0xC60
00:01:34.792 VBVA: Enabled.
00:01:35.660 Guest requests mouse pointer integration
00:01:46.929 PCNet#0: Init: ss32=1 GCRDRA=0x0169c420[64] GCTDRA=0x0169c020[64]
00:01:47.074 PCNet#0: Init: ss32=1 GCRDRA=0x0169c420[64] GCTDRA=0x0169c020[64]
00:01:54.392 PATM: Disable block at fa5fecac - write fa5fed64-fa5fed68
00:02:12.205 PATM: Disable block at fa3baa34 - write fa3baaec-fa3baaf0
00:02:33.294 Guest Additions capability report: (0x1) VMMDEV_GUEST_SUPPORTS_SEAMLESS: yes VMMDEV_GUEST_SUPPORTS_GUEST_HOST_WINDOW_MAPPING: no
00:02:37.223 PCNet#0: Init: ss32=1 GCRDRA=0x0169c420[64] GCTDRA=0x0169c020[64]
00:09:52.482 Display::handleDisplayResize(): uScreenId = 0, pvVRAM=b2594000 w=1584 h=94 bpp=0 cbLine=0x460
00:09:52.483 VBVA: Disabled.
00:10:30.572 VMMDev::SetVideoModeHint: got a video mode hint (1512x332x0) at 0
00:10:31.668 VMMDev::SetVideoModeHint: got a video mode hint (1551x293x0) at 0
00:11:04.190 VMMDev::SetVideoModeHint: got a video mode hint (1600x1200x0) at 0
00:11:28.956 VMMDev::SetVideoModeHint: got a video mode hint (1555x94x0) at 0
00:11:29.880 VMMDev::SetVideoModeHint: got a video mode hint (1584x94x0) at 0
00:11:48.610 VMMDev::SetVideoModeHint: got a video mode hint (1378x720x0) at 0
00:11:57.390 VRDP: TCP server listening on port 3389.
00:12:12.477 VMMDev::SetVideoModeHint: got a video mode hint (1584x94x0) at 0
00:12:36.737 Entering S5 (power down)
00:12:36.737 ****************** Guest state at power off ******************
00:12:36.737 Guest CPUM state: se