Hello,
It would help that user with problems @ beginning of thread. If he read the replies he got on the other forum. They answered his problem some time ago. There's no need to revert back to earlier versions. Just get the latest 5.7.2.1.
There was a problem with 5.7.1.1. Which is why 5.7.2.1. came out so soon after. See this
post. Hope I've entered this correctly.