I downloaded Skype today and did multiple calls for different friends. Audio as well as video was working fine. Then (and don't ask me why

) I right clicked on my friend's video and selected 'stop incoming video'. And ever since then, I can't undo it. It is affecting my calls with all friends - I can't see their video even if they are sending it.
I cannot find any option under Skype's menu to 'start incoming video'. I can't believe such an obvious setting is missing in a commercial grade software.
Can anyone please help?
Thanks!