Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
It does not valid, i had already reload or restart my forum, and when i access "*/uploads/system/gravatar-default.png" i could see the image what i upload, but it didn't apply to a new user.
@julian a bug?