I have a spin on a well documented problem. I have several sub sites that have this issue. Quite often when a new list item is being created, the person clicks new, types in some text and then clicks OK, they get an error that says "This Page has been modified since you opened it. You must open the page again." If you click back and click OK again you get the same error. You have to cancel and click new again to get around it. This doesn't always happen, I'd say about 20% of the time.
This is not on a new page, not adding a webpart, not editing a content editor. This is a brand new task in a task list.
This will also happen when an item is being edited. A task is edited, click OK, get the error saying it has changed. No other person is using the list. Again this doesn't always happen.
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