Happened in previous versions or only in this new one? Seems the .gif export not starts, appears the dos console with the params for ImageMagick but exits suddenly. Seems you are using Win10 right? Are you running the app as administrator? Maybe there needs some permissions but is weird.
Can you make a full process video? I mean, load a FX, press render, and when it's done export gif. Is to see if we can reproduce it exactly to see we can find the error. thanks!.