Most villagers have problems pathfinding their way over rivers, got manny bridges built but they don't use them.
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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Cannot Reproduce. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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Looks like your villagers are getting stuck on half slabs. Can you confirm this is the only case? The only details you have supplied is an image. I don't see them stuck on rivers there.