In Civilization 5 the game wants me to adopt a policy but no policies are available?

What do I do? I've tried right clicking. I just don't know what to do, the game will not let me move on without adopting a policy. This is very agitating. Someone please help.

See this link: http://forums.civfanatics.com/showthread.php?t=415703

The only way I know how to get around this is to check off the policy saving option before the game starts. I do this and then play as if I hadn't (but know that I'm safe from getting stuck like this.)

or

I found the only thing that sometimes helps is going to the unit selection and pressing left or right (the box on the left that cycles units). Sometimes...and actually now that I think about it, more times than not, it will cycle to "end turn" and get you out of the lock.