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After doing a commit to hg repository, using the menu 'Team->Share->PushToDefault' comes up with a dialog 'Select Issue Tracking Connector'. It only allows to enter data for a bugzilla connector (my project chose JIRA :() so that dialog cannot be filled and needs to be cancelled. Calling 'Team->Share->PushToDefault' a second time doesn't show the dialog any more and does what I suspected it should do ... pushing the hg commit back to kenai.
According to the reporter this was in 6.7 RC2.
*** This issue has been marked as a duplicate of 166865 ***