Problems with logging into my Blogs @ WPMU network

Hi guys

When I log into my WPMU network and select a dashboard of a blog I want to visit to add content or alter something, It basically redirects me to the login page of that blog and log's me out of the network. I think this has started to happen as I updated to wordpress 3.3.

How can I fix this? Previous to this... I used to log into my network, select a blog's dashboard and it would take me to that blogs dashboard.

This is not the case anymore.. How can I fix this?

Thanks guys :wink:

Sean