v5.2.2 is available and should be in the "My Downloads" area for your account. We haven't heard of that issue before though, so I'm not sure if 5.2.2 will fix it. If you can let us know where to see the problem, we'll gladly test and let you know what may be wrong.
As for the Error Checker result, that message explains it. There is likely a redirect on your homepage. Something like
site.com/ going to
site.com/en/ or something like that. Currently, the Autotune tool doesn't follow redirections like that for a few various reasons. If you'd like to post the site that you're testing on, we'll gladly manually check it for you to let you know if there are any errors that the error check tool would catch.
Finally, please post from the account you subscribed to JFBConnect from. That helps us to prioritize your support and investigate issues like you mentioned above.
Thanks,
Alex