virtualbox.org

I had the same issue, I tried this build and can confirm that it works to start a guest now.
You can get the log before and after this revision from the VirtualBox Public bugtracker under ticket 14370. (Can't post the link because of this warning: You must be a member for 1 days and have 1 posts before you can post urls.)

Only the VM's has no sound (but this is already a known issue under Windows 10 hosts if I'm right).

Ramshankar wrote:Could you please try installing this test build and see if it fixes the problem?

The link will expire in ~14 days automatically;
https://www.virtualbox.org/download/tes ... 22-Win.exe

We'd appreciate if you could please upload VBox.log from this build even if it happens to fix your problem. Would help us verify if things are truly fixed.

Can I install it over the current one?

Ramshankar wrote:Could you please try installing this test build and see if it fixes the problem?

We'd appreciate if you could please upload VBox.log from this build even if it happens to fix your problem. Would help us verify if things are truly fixed.

Seems to have fixed issue I was having with a LXLE VM; CPU AMD A10-5800K MEM 16GB Windows 8.1. Installed 5.0.1, no reboot, VM works. Using KVM paravirtualization.

It appears to have fixed it for me as well

Hortnon wrote:It appears to have fixed it for me as well

It works for me too...

Thanks for support!