Here's the short story: I select my weather in FSX (the "Current Weather" box). I go in there, set clouds, winds, visibility, etc., then start my flight. Usually when I start it, REX ignores what I put and starts the flight with the real-time weather. Then I go to "World -> weather" in the in-flight menu and re-set the weather the way I want it. Then it's fine. UNTIL 20 or so minutes into the flight when I get the "REX is connected to FSX, REX is gradually loading the weather into FSX," etc., whereupon REX reloads the real-time weather AGAIN, even though I have twice set the weather how I want it. Then I repeat the process and then 20 mins later, REX once again throws out the weather I set and loads the real-time weather.
Yesterday, for example, I set a beautiful VFR day into the game for a flight in the Pacific Northwest, where apparently it was raining. So even though I set VFR conditions manually (in the "Current Weather" box in FSX), the flight started with me on the runway in the rain. So I changed it back to my weather, took off, and 20 mins later, REX updates the weather to... RAIN. So I pause the flight, re-set the weather to VFR, and 20 minutes later, I'm on final approach, and REX updates the weather to... RAIN. So I had to (for the THIRD TIME in a 45 minute flight) go in and re-set the weather how I wanted it.
How can I get the weather to STAY how I set it? Once my flight starts I don't want REX connecting and changing anything. I love, love, love the textures, but this is driving me nuts.