Troubleshooting Liveries Not Loading in X-Plane 12

First and foremost, I empathize with your frustration. Liveries, as we all know, can be the cherry on top of the immersive experience in flight simulators. It sounds like you've done this process successfully before, but for some reason, the latest liveries are being a bit stubborn. Let's tackle this together.

1. Check Compatibility:
Some liveries that were created for X-Plane 11 might not be fully compatible with X-Plane 12, despite their apparent similarity. Always ensure that the livery is designated as compatible with the version you're using.

2. File Structure:
Ensure the file structure within the livery folder remains intact. It should look something like this:

• Aircraft Name Folder
  • liveries
    • Livery 1
    • Livery 2

If it's nested incorrectly, the simulator might not recognize it.

3. File Format:
X-Plane utilizes PNG texture files for its aircraft. Ensure that no DDS or other format has crept into the mix. The simulator can be picky about these nuances.

4. Overwrite Issues:
If you're replacing a livery, ensure the old one is deleted or moved to prevent potential conflicts. Sometimes, residual files can interfere with new additions.

5. Refresh the Aircraft List:
Once you’ve placed the livery in the appropriate folder, make sure to refresh the aircraft list from the main menu of X-Plane. This action prompts the game to re-scan the directories.

6. Check the Log.txt:
This is a valuable tool. Open the Log.txt file located in the main X-Plane directory. It can shed light on potential errors or reasons why certain liveries aren't loading.

Finally, if none of these steps work, it might be a good idea to reach out to the livery creator. Sometimes they are aware of quirks or have updated versions not yet uploaded.

Hope this helps, and if you provide more specific details about the problematic liveries, I could delve deeper. Happy flying!