SOLUTION (it worked for me):
Instal beta skype version (can not post the link :/ but you will find it on "downoald" page and then scroll down), and all is ok than. Guy from live chat support explained to me. Hope it will work with you also!
Claudius any news on when the update is going to push out? It's been 2 month since you replied. We use Skype for work often and Screen Sharing is a vital part when you are working remotely.
I downloaded SKYPE 6.0 and still my students only see a black screen. Do I need to purchase the premium? I don't want to do that if it isn't going to work.
Did you install after trashing the original. If I do that I have to add my contacts again, correct? I so want to be able to share my screen with my students!