I've installed PMDG B737NG in FS9 and FS2crew for it. When I tried to engage the Autothrottle on MCP, the switch returned to it's unswitched position then the red light, A/T P/RST, below it strobed. Every time I have to fly it by controling throttle manually and it's extremely troublesome! Does anybody have the same problem? Is any prerequisite setting I had missed before engaging Autothrottle? Please help me out!

Hi nameless !That usually happens when after starting the engines you have not switched on the generators.Hope it helps.Jose Luis.