Windows 10 Issues with VirtualBox 6 VBoxSVGA Graphics Controller

[Androprise]

I have setup a Windows 10 (1809 x64) VM on a linux host using VirtualBox 6.0.2. I have installed Guest Additions only (otherwise a clean Windows 10 installation. Everything seems to be working fine for a little while, then several strange things start happening. Most notably I am not able to run anything as administrator. When a UAC prompt should show the screen gets dark as normal, then instead of showing the UAC prompt I get an error dialog like the one below. This occurs when trying to run anything (not just the 7-Zip installer) as admin. When this starts happening I am no longer able to open the settings app (it opens the splash screen but immediately closes). Search also stops working in Cortona/Start. Some graphical glitches also start happening at this time.

All of these issues stop when I switch the Graphics Controller from VBoxSVGA to VBoxVGA.

The host System used is a Dell Inspiron 15 5570 (Core i5, 16GB RAM). I have tried hosting with Linux Mint 19.1 and Windows 10. Always with VirtualBox 6.0.2.

[Androprise]

The same occurs with a Windows 10 1803 x64 guest.

[Danial]

Do a clean install of the guest additions.

[Quppa]

I'm seeing the same issues with 6.0.6 (Fedora 29 host, Windows 10 1903 guest). A clean install of the Guest Additions doesn't appear to help.

In case it's helpful, here are some logs from Event Viewer for Windows Explorer crashes:

Faulting application name: explorer.exe, version: 10.0.18362.1, time stamp: 0x634b66a3
Faulting module name: VBoxSVGA.dll, version: 6.0.6.30049, time stamp: 0x5cb5a76d
Exception code: 0x80000003
Fault offset: 0x00000000000017e9
Faulting process ID: 0x103c
Faulting application start time: 0x01d4f8bcd0954ca2
Faulting application path: C:\WINDOWS\explorer.exe
Faulting module path: C:\WINDOWS\system32\VBoxSVGA.dll
Report ID: 812dc410-969d-4ca0-b890-40ec93415564
Faulting package full name: 
Faulting package-relative application ID: 

Fault bucket , type 0
Event Name: APPCRASH
Response: Not available
Cab Id: 0

Problem signature:
P1: explorer.exe
P2: 10.0.18362.1
P3: 634b66a3
P4: VBoxSVGA.dll
P5: 6.0.6.30049
P6: 5cb5a76d
P7: 80000003
P8: 00000000000017e9
P9: 
P10: 

[rsauget]

Same issue for me +1 By the way, it's gone when graphic acceleration is disabled. Might be a come-back of https://www.virtualbox.org/ticket/17082 ?