W715 streaming problem

Hello,

I have a problem with streaming on my W715 ( not Vodafone branded - anymore :a004 )

Anyway ...

1.When i try to access the Youtube application and i press PLAY i get a black screen but timer is running and no video/sound ( on wi-fi and live!, because i got a data pack as well )

2. if i go to any video site i get: CONNECTING TO MEDIA SERVER / CONNECTED TO MEDIA SERVER / MEDIA PLAYBACK FAILED :(

3. If i go to m.youtube.com i do not get a black screen when i press play, i have BUFFERING 00% , and .... nothing.

Basically i cannot view any videos on the internet ( wi-fi connected or V live! )

I know that this problem should be common.

Could you please advise me on this?!

Thank you in advance.

Cheers!