Yes I obviously have the same problem and I currently use the ADE tool to tweak a little at the most airports I buy. KLAX is the only one, where it doesn't save the changes.
As I've said, the KLAX scenery is a 100% compliant AFCAD, and nothing in it prevents to be edited and saved back.
A common mistake is saving it back using a different name, which will create a conflict, since you will now have two AFCADs for the same airport. If you really need to edit the AFCAD, you must save it with the same name as the original one, and on the same location.
If you are sure you are doing this, than the problem can only be caused by something which IS 100% standard SDK, but is not supported by your version of ADE, so it's not saved back. Again, there's nothing in the .BGL which prevents editing or it's not 100% standard.
I open the Afcad file bgl KLAX_AP.bgl in ADE
I make changes, and go up to file... save like I do with each afcad I edit
It says "save successful" but when I open the projects folder in ADE it does not list KLAX at all.
I cannot save OR compile the afcad file after making changes?
I downloaded an afcad for FSDT klax from avsim by Kevin Boydston, opened it up in ADE, went to file... save. and it saved to my ADE projects folder. There is something buggy with the latest LAX afcad as supplied by the autoupdate system I ran after the last GSX installer
I would rather use the latest afcad from the autoupdater even though Kevin spent a lot of time adding many parking spots. I'd like to make the changes using the latest afcad as a base in case any changes have been made since Kevin updated his afcad in late 2016.
A couple small problems with both afacds Id like to change such as some fuel parking spots should not be coded fuel fsx thinks this is an aircraft parking spot, the fuel spots should be changed to vehicle.