Windows 10 host, Windows 7 guest : Video playback is FAST

[i2Paq]

I recently updated my host to Windows 10, this was a clean install

I then installed the latest version Virtualbox (Version 5.1.2 r108956) and the latest Valuepack.

I then re-created my VM machines using only the disk-files.

The issue I'm running in to is that after this some video playback on my W7 hosts is to fast.

I've de-installed Java, Flash, Video-device and re-installed them but the issue remains.

The strange thing is that it does not happen to all sites or video's.
Some sites have mixed video's and some of them I can view normally while others play as in fast-forward.

Attached a clean set of log-files.

Thanks!