After installing 1.3 I added a few of Nathan's liverys and the dissappearing setting started. I deleted those additional liveries from the aircraft folder and aircraft cfg. and it's funcitoning fine again. Try deleting your BOAC and see if that helps.
Still having glideslope issues if anyone has any ideas there. Fine on flights up to 1/2 hr. but then on longer duration flights the glidescope goes on but just won't move up, down or anywhere. Cleared registry as per KB#685, did reinstall, and using a FSX default aircraft on initial load. Still no luck with the glideslope indicator.