Linkedin authentication returns "Internal Server Error"

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I am hosting this on askbot.com and configured both Facebook and LinkedIn for login access. Facebook works without a problem but LinkedIn throws an error "Internal Server Error" (I don't have enough Karma to post an image).

I've gone over the configuration on the LinkedIn side and verified my app is set to 'Live'. I've consulted all the docs and don't see anything outside the ordinary for setting this up in the askbot settings page.

Any ideas??