Hi Andres,
If you have a look at the codeplex page for the blog module http://dnnblog.codeplex.com/releases/... , it says "RC" - "release candidate" - So there might still be bugs on that version.
They also mentioned:
"NOTE: Until the "RC" is removed, please refrain from installing in production environments without careful testing and backups (if a showstopper is found, this release could be replaced)."
So the problems you have might still be bugs.
Regards,
Aderson