There are multiple components in flower fragrances. Some of them, in fact, are detectible by pollinators, but not by humans. And the pollinators are the targets. This why fragrances are what they are and why orchids expend the energy to emit them at times of day or night when the desired pollinators are active. Some orchids even fine tune the effort, emitting different scents at different times of the day. The relative intensities of the various components we can detect in a complex fragrance are variable from flower to flower and from time to time. I have a walkeriana that bloomed in November. Along with the usual fragrance, there was a sort of sour smell. The same plant is in bloom again right now, and the sour component is not there. It has a spicy-perfumey scent that I think is very nice. My wife doesn't like it, though. To her nose, the fragrance is too strong. Anyway, maybe a walkeriana has a logical reason for producing variable scents. Maybe environmental conditions at the time of blooming such as light, temperature, or humidity have something to do with it. If so (and I don't know that it is), maybe, the next time your walkeriana blooms, you'll like the fragrance better.

Myrica (Morella) cerifera? Here is a link that might be useful:

plants4chris, the only thing i can think of is that the bees have died. wax worms have took over and thats the end of it. in the fall of the year when the bees are working sumac you will have a bad smell from the nectar,which clearsup when itis ripened.also if the hive has foulbrood disease you will get a foul odor. check the comb,if the cells in the comb are sunken in examine futher. the bee grub will be a dark color and not white. hope this helps. dannybee

Thanks for all the comments and to Ruth Ann for identification. The trumpets are darkening as they age and opening a little earlier in the evening. I go out several times during the night just to enjoy their fragrance. 'Frosty Pink' has two main trunks with fewer but larger blossoms on the second trunk. Young plants from cuttings last winter are finally showing some growth. They have stayed very short most of the summer and doubt any of them will bloom this year.