@Igor
Yes, I am still using AVAST because (apparently) it is not major.
But like you have guessed, the fact that it is UNKNOWN, considering that Windows Media Player is a common component of Windows and how critical any antivirus is, is a bit worrying in my opinion.
@Zyndstoff
"Why is it worrying? If it is not reproducable, it isn't."
You should say "until AVAST team cannot reproduce it, it is unlikely they could fix it".
A different story. Saying "it is not reproducible" like saying the issue does not exist is the last thing you can say to somebody who is seeing the "not reproducible event" in front of him.