Ok good James... So now turn on the add-ons again (only the add-ons). So from Steve, go backwards
>> Rename add-ons.cfg.hld back to add-ons.cfg
Try your sim again.
Start? If yes, then the add-on.cfg is not a problem. If no start, then the addons are a problem.
Do the same with scenery.cfg, (Turn addons off) but now >> Rename scenery.cfg.hld back to scenery.cfg
and start up the sim. If a no go, then something is wrong with that previous scenery.cfg
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As for the recent new scenery.cfg (from P3D bootup), your scenery library is kind of empty right now.
So send me that scenery.cfg.hld or that previous scenery.cfg file.. I can take a peek at it.. and send it back to you .. sure don't want you to have to add everything back by hand.
Norm