I have an extension that implements, IExtension, IExtensionConfig and IPersistVariant. Every so often (about 30%) of the time, when I start ArcMap, the extension appears in the customize\extensions menu as "License not available". The extension does not require a license. I haven't isolated a pattern as to when it happens and when it doesn't. Anyone know which property I should be looking at? The state property is set to either enabled of disabled.