20 Jul 2005
12 Oct 2011
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I am having this issue as well. I have no workflows, and the Pages page on the backend page does not indicate any pages are locked for editing by any users.
This single content block is used by 12 pages, and I have been having issues with it from the start. Yesterday I updated to 4.2.1733. Prior to the update, I received only the triangle with the exclamation point with no specific message as to cause. Post-update I am receiving the message as reported by the other user.
If I go to each of the pages listed as not having it applied, I can edit the page, edit the shared block, click "Update" in the message preceding the block (the message tells me its content is outdated), save the block, and then re-publish the page. However, this is tedious.