Hi, I have 2x brand new Macs (don't worry I'm no beginner!), a MacBook Pro and iMac.
All software is up to date etc. etc, but Skype only works one way depending on who calls who.
iMac dials MacBook - MacBook can see iMac and self in thumbnail video, iMac has no Video but can see self in thumbnail video
MacBook dials iMac - same but other way round
Audio is fine both ways.
Using the latest download of Skype by the way and nothing in preferences which suggest anything is out of order. Is this a Mac to Mac thing?
Just one other point, There are no thumbnail previews for any of the contacts in the contacts window either.