I’ve said that you can jinx blooming by speaking of it too soon, and actually experienced it. Right after showing the buds and saying that I was going to flower Hoya soidaoensis, eight large buds yellowed and fell right off the plant just before opening!  Fortunately I figured out the problem, and am confident that the rest of the buds will open soon.  Here is the first flower to open on the plant so at least now I can say that I have flowered this difficult little Hoya.