i just installed the latest version of vbox 4.2.6 on windows xp and 9front boots just fine. there where no changes related to supporting vbox. the only problem we had was a bug in realemu some time ago that got exposed with the vbox vesa bios but that doesnt apply to stock plan9. maybe 9load problem? did you got the kernel loaded? maybe its because we use apic interrupts by default?
http://9hal.ath.cx/usr/cinap_lenrek/vbox.4.2.6.png -- cinap
