An interesting quirk. Earlier, when I moved the Polyline, the Revolve moved with it. Now, when I move the Polyline, the size of the Revolve changes. In the intervening time, I had moved the Polyline's Reference Point to the end of the line used as the rotation axis, but resetting it to the default position did not change the new behavior.
What's up with that?
TC Pro Platinum 2017, 2016 & 2015 (all with LightWorks) & V21
System: i7-5820K @ 3.30GHz, ASRock X99 Extreme4, 16GB DDR4-2133 RAM, Gigabyte GTX 970, Samsung NVMe SSD 950 (256GB), Windows 7 Pro (64-bit) SP1