I had the same problem at one time. Turned out I had vBOptimize installed and I had to use the Flush Cache in that section to make the notices show up. If you don't have vBOptimize installed, try flushing your browser cache.
Then it must be as h@cker said - a problem with the skin you're using. As a diagnostic measure, change to the vB default skin and see if the notices show there. If so, then your skin was not coded to show notices.