Thanks for your reply to an enquiry about a method to open an audio transition in the viewer window …I since remembered that one doesn’t do that!
Regarding the comments about dissolves; with all respect it may be yourself who has misunderstood:
Unlike white coated men at early 1980’s film labs, or Sony BVE9000, or the old Quantelbox; FCP has never been happy to perform after splice dissolves when the incoming clip is sourcing the very first frame of Media, however it will do so if you twat around in the viewer for a while.
I hope this helps to give you a better understanding of Walter’s good suggestion in the referred thread.