Hey Doug,
thank you for your response.
I have already set my P3D desktop icon to "run as administrator" at all times, the "Enable Add-ons" prompt still showed up on every start (those messages went away once I uninstalled the sceneries). My problem is, I can't re-install the sceneries (i.e. LGKO, LPPD) back into the sim no matter what I try. Orbx Central creates the correct folders and the library shows up in the correct spot, but somehow P3D doesn't recognize those sceneries anymore. That's why i thought the sceneries didn't register correctly in the .cfg. I also tried the sync simulator function a couple of times before but it didn't fix the problem I'm afraid.
Here is what i've tried the last few hours:
Deleted Scenery.cfg and let it regenerate (verfied the files and synced simulator after that)
Completely deleted my Orbx Library and the sceneries inside it several times and tried to rebuild the Library in different locations
Run everything as administrator
Sync Simulator
Reinstalled the Sceneries
Recycled Prepar3D.cfg
Reinstalled Client, Content, Scenery Data of P3Dv5 then verfied all sceneries in Central
No matter what I try, LGKO (and other sceneries that only install into a library) installs correctly through Orbx Central but then doesn't show up / doesn't activate in P3D anymore. P3D also doesn't ask me to "Enable Add-on" on start up at all anymore.
Any other ideas on what I can try or what I'm doing wrong here?
I appreciate your help!
Best,
Alex
Ps.: Maybe this helps identifying the problem: my FsLabs aircraft are also completely gone from my vehicle list. I didn't do anything to them... all of the FsLabs folders still show up in the correct places but the sim doesn't recognize the aircraft anymore. My PMDG stuff is still there, working fine. Reinstalling the FsLabs several times didn't help here either. The installation creates the correct folders and registries but P3D doesn't recognize anything anymore...