After four or five reports that the SettingsMaster Add-In was failing to create it's toolbar on some systems, I finally gave up and quit relying on what the Visual Studio documentation says about the ext_ConnectMode.ext_cm_UISetup on OnConnection. On some systems it turns out that there is no way in the world that message is sent. I changed how SettingsMaster works to always create the toolbars and commands when it loads if they don't exist. That seems to be the only way to truly ensure the Add-In registration actually works.