I am getting strange behavior with the preview window. It works correctly most of the time, except it updates when I don't expect it in 1 case. I have attached a screen-shot which shows my window layout. If I move the mouse cursor from the bottom tool (the search results) into the preview window (crossing the file tabs toolbar), the preview window updates unexpectedly to what seems like a random symbol (I think it might be the previous symbol that was displayed, but not 100% sure yet). If I move the mouse really fast into the window, it stays on the symbol result, as expected. Moving the mouse from the main edit window into the preview window (from the left) does not have the same problem.
I have also noted that when the mouse enters the gray area of the Search results (the docked window title area), the preview windows scroll bars get "bigger" (like the area increased), but the contents have not yet changed. As soon as the mouse changes to the re-size cursor as I continue to move it up, the contents immediately change.