zenphoto version 1.1.5 installed my web site.
Recently, I tried the Rating system.
Ratings data is reset What should I do?

Rating Manual is about somewhere?

I don't exactly understand what you mean with "Ratings data is reset What should I do?". Could you please provide a little more detail about the problem you have?

Info about the rating functions can be found in our functions guide www.zenphoto.org/documentation