FS9 add-on scenery disappears afteer closing FS9

hi,
here is the way i ad my add-on scenery
1) placing or unzipping it in the FS9 add-on scenery.
2) settings - scenery library - add area
3) selected the scenery - ok
4) close FS9 and restart
then i go to the go to airport , select add-on scenry and use the proper scnery, so farf no problem but when i closeFS9 and restart it the add-on scnery is gone.
after FS9 is closed i opened the FS9 add-on scenery and they were still there, what happened and how to correct it.
I tried several times to re-instal it but allways with the same result. Hellllllllllllllllllp

here is the way i ad my add-on scenery
1) placing or unzipping it in the FS9 add-on scenery.
2) settings - scenery library - add area
3) selected the scenery - ok
4) close FS9 and restart
then i go to the go to airport , select add-on scenry and use the proper scnery, so farf no problem but when i closeFS9 and restart it the add-on scnery is gone.
after FS9 is closed i opened the FS9 add-on scenery and they were still there, what happened and how to correct it.
I tried several times to re-instal it but allways with the same result. Hellllllllllllllllllp



