Just checking in to see if that was the expected behavior… No, I didn’t change the zoom factor or touch the other controls.
I understand the problem but for the average user the obvious question would be: why bother with a preview if it isn’t predictable or accurate? For filters like Retinex or Tone mapping, which tend to be abstract and setting sensitive, if the preview and output don’t match, it is very difficult for the user to determine which settings are appropriate for their use case.