We don't use, don't require, don't install or touch an existing installation, and are not being affected or affect FSUIPC so, if you had problems with it, they are not dependent on the scenery.
Also, in FS9 there's no DLL.XML or EXE.XML that might be corrupted or wrong: any FS module that is found in the FS9\MODULES folder will be loaded so, our installer doesn't do anything special in FS9, other than simply copying files.
If you uninstall any of our sceneries, and reply Yes to the question "do you remove the Addon Manager?", it will be exactly the same as if the scenery was never installed so, if you still have issues after doing this, you can be sure it's nothing related to our stuff.