If you have a build that is disabled, and you try to "checkout & build build", then nothing happens. While it is reasonable that "checkout & build build" doesn't work when the build is disabled I think the current behaviour is very unfriendly.

Really, I'd like to be able to trigger a build manually even if automatic building is disabled,
However, there should otherwise be a message saying that the build will not happen because the build is disabled.

Maybe if having the build disabled is meant to stop the user manually triggering a build, then the "c & b b" button should be disabled too. (I actually like giving error messages better than disabling controls, because it can be difficult for a user to ascertain why a control is disabled, but on the other hand it is a bit mean to provide a button that won't work, because the user doesn't realise it won't work until they press it. )