exterior lighting and liveries

I'm running 747X ver. 1.40 on Vista Ultimate 32 bit and FSX SP1.Everything works fine except following issues:1) Exterior nav and strobes randomy turn off and won't come back on and stay on...even after ensuring the correct switches and keyboard commands are used.2) Installed livery download packages and they show up correctly in the aircraft selection menu, but when you try to load a livery, the aircraft continues to render in the PMDG house colors. For some liveries, a portion will load like engine nacelle paint schemes..but rest of aircraft stays in PMDG house colors.Any ideas?ThanksSamir