For Windows 8/10 it's a dead end until such time as the devs announce a long overdue complete revamp of graphics acceleration options (hint hint).Tazling wrote: Is this a dead end, i.e. is there no way to get around this limitation?
Win7 in a VM would work better than Win10. Though speaking frankly even the DirectX support in Windows Guests seems to be bug ridden right now (e.g. even DxDiag hangs in both 5.2.0 and 5.2.2). The devs are fighting hangs and boot failures on multiple fronts. The best I can suggest is a Win7 guest, and perhaps try a VirtualBox 5.1.x branch install with matching GAs.