MrFreeze,
just another couple of things you could try, if you haven't already.
Go into 'menu' from the remote control, then go into the 'picture', scroll down to '3D' and enter the set up menu
This gives you a selection of tweeks for the 3D. Select side by side in the 3D Mode menu.
Scroll down to 'Picture Correction' and select it. It should come up with a menu saying 'picture correction completed
Try turning 3D Auto View on and off.
Also try moving the 3D View Point.
And are you using a HDMI cable rated as 1.3 or 1.4 - sounds obvious but I was tearing my hair out (what little I have left) trying to figure out why my bluray player wouldn't read the USB flash drive I had inserted to get BD Live view until I realised it was a USB1 stick and wasn't fast enough.
I've not got sky, but it has worked with everything else I've watched on it so far.
Rob