HELP – New page added replaced the front page (posts)

Hello,

When adding a new page on my blog, he just flipped out and replaced the homepage (which is still configured to display the most recent posts.

Except that when typing MYDOMAIN.COM/BLOG (displaying the page posts) it just goes to MYDOMAIN.COM/BLOG/NEWPAGE

I do not know how to solve this and this is not the first time that happens to me. I had to reinstall the wordpress to solve before … but now I’m in a well advanced settings of the seat and would be a long delay to resolve that. Not to mention that there is no guarantee that will not happen again.

And then, HOW-TO? : P

Please, if someone can give me a solution will be of great value.