To be frank I don' t understand what you mean. As I said - I never downloaded/installed your Lihue scenery (or any other FSDT scenery). So what does have an Addon Manager to do with the stutters and the pop up in the default PHLI scenery?
Either you have downloaded some FSDT scenery in the past, so the Addon Manager is still there, or you use another product that requires the Addon Manager too, for example the QW757
But at PHLI I get the problems as described in my first post
In older Addon Manager versions there was a specific problem ONLY with the PHLI detection (meaning, detecting if it's not installed, in order not to give unneded Trial messages if you don't have the scenery) and yes, if an airport handled by the Addon Manager is incorrectly listed as being installed when it's not, it will also result in stuttering, since the program is trying to find files that don't exists, which is why the program needs to search if a scenery is really installed, and this wasn't correctly implemented at PHLI, but it's now fixed in the current version of the program.
You can get the updated Addon Manager either by reinstalling a product that uses it (perhaps the QW757 ?) OR by downloading the Stand-Alone Addon Manager, which is available in every "Info" page of every product in this web site.