The problem seems to crop up consistently on the -X, -Y, -Z sides of the volume bounds, although I've occasionally had it show up in seemingly random spots near the middle of the volume too (couldn't reproduce this for a simple attachment).
Ok, the workaround (round the density to the closest integer value) is easy, so this isn't a show-stopper … but it's really weird and annoying to have to worry about.
Any ideas? I'll admit I didn't spend much time RTFM before coming here

9.5.315