Regarding this crash that appeared multiple places in the forum, all of the people of my wing having it in MP are muds and choppers.
We think it could be related with this file
\Eagle Dynamics\DCS World\Config\Effects\ParticleSystem2\vehicleTrail.lua
This one appeared in the 02/20 OB update and that's where the crashes related to bowwave appeared. shipTrail is using it too, but is present in stable, not causing any crashes.
I advised you test by either :
-removing the file (keeping a backup somewhere if removing it crashes the game even worse)
-in the SAVED GAMES\DCS\Config\options.lua, set ["effects"]=3 to 0 to try disable effects if this is a valid option.Not sure it'll accept 0.... It won't be pretty but might eventually solve it.
I haven't any one yet on my side testing it as they all moved to stable, and didn't encountered the crash myself so can't be sure. I should test in MP as it apparently doesn't occure in solo...
If you wish to have a try and can report success/failure that would be nice !
Thanks.