I have been using version 3.85 for about the last year and didn't have any problems with it. I recently updated to version 4.40 and have noticed that the 'effect preview' window is missing from this newer version. The window was used to show what overlayed effects looked like on the main video. This was a function that I used a lot and still need to use for my editing.
It may still be there and I might just not be able to find it. So if anyone has any information on this topic it would be much appreciated.