Acustica-Audio Nebula4 VST3 does not show up at all (not even on the list in the Plugin Manager) in C9.5.40 but was working fine in C9.5.30. A-A N4 VST2 version works as expected though.
A bit of a bummer really as I would like to keep as many of my plugins as possible in VST3 format. Other than this issue, 9.5.40 seems ok…so far.