I use REX to get weather data(EGNT),in local pressure is 978hPa,but when i click B(default fsx set) button is get 1013hPa,and i check in fsx weather condition was same 1013hPa,it's fsx bug?And i set 978hPa to altimeter,pointer is 0,is normal? If set to NGX could be -xxx altimeter.

Could be some type of weather suppression through another program. If you're running REX over a network (not sure if this is possible - I know ASE can do it), your firewall could be blocking the weather between your REX computer and your Sim computer.

@Kyle Thanks for reply,so far i know is REX issue..so only wait for fix.