I was having the same pink texture issue as soon as the pax would sit down. I tried moving my liveries to the default fenix directory but could only get one livery to show the correct textures. It was the only folder that the model folder was added/created in.
Then I gave me full permission to the fenix liveries folder and all my liveries now get the model folder. They all appear to be working correctly now. Maybe it was just coincidence. I don't know, and I don't care, but if you are having this issue then it can't hurt to try. You can always remove the permissions afterwards.
Now, I have not moved my folders out of the default fenix livery folder (fnx-aircraft-320-liveries). The default folder however is not in my community folder. I still use addon linker to handle all that and keep things neat. It's quite possible that you don't need them in the default fenix livery folder if you give full permission to the folder containing your liveries. It's something you would have to try. If it doesn't work, try moving them to the default livery folder and allow full access to that folder.
Again, this worked for me. It may not work for you. Right click on your livery folder and select properties. Then select the security tab and work your way around to editing the permissions. I'm not here to explain all that, so don't ask questions on how to change permissions on a folder. Google will do that for you.
Good luck.