After upgrading to Yosemite I see under App Store > Updates.

This update is for an app downloaded with a different Apple ID. Sign in with that Apple ID and try again.


What works for me is this hint from https://discussions.apple.com/thread/5532426?start=45&tstart=0

I solved this problem, instead of going to the update page go to the app itself within the App store. Here it will say "Accept" where it usually says download and then it will reauthorize you

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