Currently the main view of the forum does not have a container .... That is ok, as it doesnt really need one. The only thing is ... its a lot harder to get to your forum settings now. I found a work around: start editing a post, because you have a container there, and click on "my settings" ...
My suggestion would be to put a container around the forum that just offers the module actions in the footer of the container ... so it would be a very basic container ...
cheers,
erik