propeller visibility in flight 1 441 conquest

i am flying the flight 1 441 conquest with the fsx compatibility patch. operating system is windows xp with all service packs installed. plane looks and flies very well except that propeller disappears hidden behind clouds when plane flies through or is viewed against clouds in foreground. i have come across a number of fs9 airplanes with this issue after they have been patched for fsx. there are fixes for this problem for xome planes, but none of these works for the conquestif the modified .bgl file is simply substituited for the original one. from what i have read, it may have something to do with the alpha channel in the propeller.bmp file. does anyone know of a modified .bmp file which will fix this problem for the 441 conquest.thanks kindly for any help.steve chavin