Addon Scenery not saving in the scenery library

Hi all. I've never had this problem at all since I've been using FS9...
...Well, I go through the usual process of adding 3rd party scenery to FS9, then after I add it to the scenery library and restart FS9, I check the scenery library and find that the entry has totally disappeared
No matter how many times I try, the scenery just seems to leg it everytime I restart FS9.
Hopefully someone can provide me with a solution. I'm running Vista 32bit if that helps in any way at all.
Cheers :)
Black Sheep 8-)
...Well, I go through the usual process of adding 3rd party scenery to FS9, then after I add it to the scenery library and restart FS9, I check the scenery library and find that the entry has totally disappeared

No matter how many times I try, the scenery just seems to leg it everytime I restart FS9.
Hopefully someone can provide me with a solution. I'm running Vista 32bit if that helps in any way at all.
Cheers :)
Black Sheep 8-)