Sorry for long wait, finally have some time to play. As I promised, did some testing with Neutrino. Test mods I have now are:
GraphicsLib 1.0.2
LazyLib 2.1
Nexerelin 0.7.6c
Neutrino Corporation 1.83-RC4.3
What I do:
Start New Game > Enable Corvus Mode > Choose Neutrino Corp > Choose Upsized Military Unit > Any level and rank > Attack any Neutrino fleet I see > Combat is loading, as soon as my ships start moving - crash > Log:
404583 [Thread-4] ERROR com.fs.starfarer.combat.CombatMain - java.lang.NoClassDefFoundError: com/fs/starfarer/combat/systems/H
java.lang.NoClassDefFoundError: com/fs/starfarer/combat/systems/H
at data.hullmods.NeutrinoSigmaUpgrade.advanceInCombat(NeutrinoSigmaUpgrade.java:191)
at com.fs.starfarer.combat.entities.Ship.advance(Unknown Source)
at com.fs.starfarer.combat.CombatEngine.advanceInner(Unknown Source)
at com.fs.starfarer.combat.CombatEngine.advance(Unknown Source)
at com.fs.starfarer.combat.CombatState.traverse(Unknown Source)
at com.fs.state.AppDriver.begin(Unknown Source)
at com.fs.starfarer.combat.CombatMain.main(Unknown Source)
at com.fs.starfarer.StarfarerLauncher$1.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: com.fs.starfarer.combat.systems.H
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 9 more
If i start it with non-Corvus mode it also crash with same log, if I attack someone other than Neutrino (like neutral smugglers), it takes a bit longer (ships move for few seconds in combat) but crash nevertheless.
I have also tested it with RC 4.2, it crashes before even loading combat. As you can see my mod list is minimal, so it doesn't mean it's an incompatibility issue with other faction mods. My Starsector is 0.7.2a to be clear and all other mods work fine.
Hope that helps.