FS edit SDK and panel modifications

ok, so i tried finding some info on my little problem, but i have had no luck. maybe some of you might have had this same problem
i downloaded the FSedit SDK a few days ago and modified some panels to some of the planes in my library. This isn't the first time i have done this. previous times were all successful, but this time, when i modify the panels, it will erase sections of the panel.cfg file. i did change the bitmap image file name in the .cfg file, and it did show up in the editor. but once it was saved, it didn't show up in the actual simulator. so i checked the cfg file and it was gone. any ideas or what is the proper procedure to modify panels
On a secondary note, does anyone know of an accurate panel for the p-40?
i downloaded the FSedit SDK a few days ago and modified some panels to some of the planes in my library. This isn't the first time i have done this. previous times were all successful, but this time, when i modify the panels, it will erase sections of the panel.cfg file. i did change the bitmap image file name in the .cfg file, and it did show up in the editor. but once it was saved, it didn't show up in the actual simulator. so i checked the cfg file and it was gone. any ideas or what is the proper procedure to modify panels
On a secondary note, does anyone know of an accurate panel for the p-40?