Cannot seem to create new Magento admin groups in system.xml and adminhtml.xml

When learning to create a module that adds new administration groups to the Magento admin panel, follow these instructions:

However, something they fail to mention is that after you have created your new admin groups in system.xml, and after you have created your adminhtml.xml file (to allow permissions) you must LOG OUT AND LOG BACK IN (as administrator) to re-load the ACL and allow the new permissions to take effect!!! A tiny but hugely important detail. Failing to do so leads to hours of troubleshooting!!!

You heard it here first...