I had an issue when trying to access the Karkand expansion maps, I would get a message saying I had not purchased the expansion. I found a workaround...
On the upper right hand corner of the Battlelog home page their is a SIGN OUT option. Click this and then sign back in. Loggging out of origin will not make a difference seems to have to be the Battlelog sign out has to be used.

I know they are working on this issue, but doing the above has worked for me and others.

Thanks for the great post hopefully this will help a lot of people.

GOA.Luke*BK*

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Perhaps that will qualify me for an promotion to an official rank?