virtualbox.org

Upgraded from v6.1.26 -> v6.1.32 to add RHEL 8.5 Guest Extensions Support and came across this issue.

Guests would hang shortly after starting and mainly after a GUI login. I.e. Desktop shows and then Guest hangs.
VB Windows process would go to ~35% Utilization for each guest.

Vbox Log indicated maybe an audio issue:

00:00:31.659479 GUI: UIMachineViewNormal::adjustGuestScreenSize: Adjust guest-screen size if necessary
00:00:31.659501 GUI: UISession::sltAdditionsChange: GA state change event came, notifying listeners
00:00:31.659504 GUI: UIMachineLogicNormal::sltCheckForRequestedVisualStateType: Requested-state=0, Machine-state=5
00:00:32.727202 Audio: Warning: Scheduling hint of stream '[WasAPI] Output:0' is bigger (140703128616965ms) than used period size (0ms)
00:00:32.939314 Audio: Warning: Scheduling hint of stream '[WasAPI] Line-In:0' is bigger (140703128616970ms) than used period size (0ms)
00:00:33.344308 GUI: Releasing mouse on capabilities lost
00:00:54.304350 GUI: Releasing mouse on capabilities lost
00:01:01.565870 VMMDev: vmmDevHeartbeatFlatlinedTimer: Guest seems to be unresponsive. Last heartbeat received 4 seconds ago
00:01:08.704426 GUI: Releasing mouse on focus out
00:01:08.704453 GUI: Releasing keyboard on focus out
00:01:08.704832 GUI: Machine-view #0 unfocused, reason=4
00:01:23.911386 GUI: Capturing keyboard on focus in
00:01:23.911447 GUI: Machine-view #0 focused, reason=4

Disabling Audio in the Guest seems to stop the issue. Luckily I don't need audio for my server labs

Did you try uninstalling VirtualBox from Control Panel, then deleting Oracle folder in Program Files (assuming you only have no Oracle products other than VirtualBox folder inside it), then reinstalling VirtualBox 6.1.32? I do that all the time without loosing my Virtual Machines or their settings!!