Seems some developers get some files mixed up from time to time.
This is more common than you might expect. Sounds like you've installed at least some aircraft using an auto-installer. If you install them manually it's unlikely to happen.
That's what I was thinking. I prefer to do the install myself, but I don't know of any way to do it when...
wait a minute, I think I just figured out how to bypass the auto-installer. Change the destination folder to a temp and then install it myself. Think that will work?
That's the method recommended by most of the old hands. It's easy enough to point the install path to a Temp folder anywhere convenient.
I install a lot of files to check them out & have also configured auto-installers. The most common auto-installer used by Freeware developers works in the same way as extracting zipfiles direct to FS. They need to overwrite default folders to work properly. This is all very well if the person that configured the zipfile or auto-installer knows what they're doing & tests it thoroughly before uploading it. Unfortunately this is very often not the case & I've seen many files that are incorrectly configured. This is one of the most common causes of installation problems & also problems with FS itself.
Another problem is that the uninstal.exe file created by these installers will overwrite the FS default file which can give problems if you ever wish to uninstall the addon or FS itself. The Uninstall option can be disabled when the file is configured but many people using the auto-installer software don't appear to appreciate that, even some experienced FS developers that should know better.
As to the original question, I've had a couple of aircraft give me error messages before loading and it's always a gauge error. I think I'll check to see if it is one that is in the sound folder and not in the gauge folder. If that's the case, I'll move it and see if it stops the error message.
Worth a try but take my advice & when pasting gauges into the FS Gauges directory do NOT overwrite files/folders if prompted.