This have happen to me several times, more often when I´m landing, for instance yesterday I did a flight from LOWW to EFHK, flying on 777 PMDG, everything was right until the approach time, I was stablished on localizer and following glideslope with APilot, in the moments prior landing the speed started with a strange behaviour increasing and descending randomly until it fall low than a vref speed, I could observe 115 kts so the nose of plane started to pitch up and I had to execute miss app, I can say that behaviour is observed in several payware planes using third person weather, in this case I'm using FSrealWX freeware, during the takeoff and cruise everything is cool, the problems begin in app phase. I'm using FSUIPC 3.48. with smooth change of winds activate.

 

Please someone knows about this issues?....is there software reasonable good not showing this kind of behaviour?

 

Thanks in advance

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Well, if you use real world weather it could be because of turbulence effects, descending thru clouds etc etc. Hard to tell without seeing it myself, but it doesn't have to be an error. 

Have seen ActiveSky 2012 do some strange stuff on occasion.

 

Havn't seen ActiveSky Next do anything strange yet, though I'v only been using it since December 2013. I was really impressed with ASN recently flying into Dubai with a massive thunderstorm with possible hail! (And sound effects of hail - LOUD) just offshore, and then CAVOK (PROB30 inter TSRA 4000m visibility FEW120CB) over land (due to sea breeze or similar effects).

 

Passing about 5 miles offshore all the CB and lightning and rain was behind me, and on turning around to land rwy 30L the Thunderstorm and lightning was clearly visible ahead not 5nm from the airport, but the sky directly above the airport was totally clear.

Exactly how I've seen it at Sydney airport and many coastal locations during warm thunderstorm weather. It seems that ActiveSky Next really has reached the stage that I'll trust it.