Diplomacy screen - relationship lines

[Coyoteocean]

My diplomacy screen fails to display any of the relationships between civs (in the form of those coloured lines). Am I missing something?

 

[Black Fluffy Lion]

this is a common problem. Happens to me sometimes as well... Anyone got a fix??

 

[whiteheg]

With me, it was an OpenGL driver issue. I updated the drivers for my graphics card (ATI rage 128) from the ATI site and the lines appeared!!