Is it stable the latest version?

Hello:
I have seen in the forum that someone talk about diferences between two versions (May and August).
The official version seems the 27 May version? Is it true?
I tell it becouse in download section is available this version but in a post, the file is the august version.
I download this version (August) and probe some topics and i I have doubts about everything and as stated in another post, on the show and hide methods.
Thanks a lot.

The latest dev. code has not any major modifications and will not break backward compatibility with previous one. It contains only bug fixes ( one of which was the reason of regression in template rendering )