Vanilla game, no mods, only changed the settings so that devmode = true.
Upon quicksaving for the first time in campaign mode after a clean new install, game crashed. Log excerpt is as follows:
2759812 [Thread-6] INFO com.fs.starfarer.campaign.save.CampaignGameManager - Saving to ..\\saves/save_Shepard_6251720336728343738...
2762140 [Thread-6] INFO com.fs.starfarer.campaign.save.CampaignGameManager - Finished saving
2762140 [Thread-6] ERROR com.fs.starfarer.combat.D - java.lang.RuntimeException: Found 1 serliazed classes not marked with DoNotObfuscate.
java.lang.RuntimeException: Found 1 serliazed classes not marked with DoNotObfuscate.
at com.fs.starfarer.campaign.save.CampaignGameManager.super(Unknown Source)
at com.fs.starfarer.campaign.A.o00000(Unknown Source)
at com.fs.starfarer.super.for.while$super(Unknown Source)
at com.fs.A.super.Ò00000(Unknown Source)
at com.fs.starfarer.combat.D.o00000(Unknown Source)
at com.fs.starfarer.StarfarerLauncher$2.run(Unknown Source)
at java.lang.Thread.run(Thread.java:619)
This was the whole chunk from the log that had anything to do with saving, altogether:
119765 [Thread-6] INFO com.fs.starfarer.campaign.save.CampaignGameManager - Saving to ..\\saves/save_Shepard_6251720336728343738...
122797 [Thread-6] INFO com.fs.starfarer.campaign.save.CampaignGameManager - Finished saving
2759812 [Thread-6] INFO com.fs.starfarer.campaign.save.CampaignGameManager - Saving to ..\\saves/save_Shepard_6251720336728343738...
2762140 [Thread-6] INFO com.fs.starfarer.campaign.save.CampaignGameManager - Finished saving
2762140 [Thread-6] ERROR com.fs.starfarer.combat.D - java.lang.RuntimeException: Found 1 serliazed classes not marked with DoNotObfuscate.
java.lang.RuntimeException: Found 1 serliazed classes not marked with DoNotObfuscate.
at com.fs.starfarer.campaign.save.CampaignGameManager.super(Unknown Source)
at com.fs.starfarer.campaign.A.o00000(Unknown Source)
at com.fs.starfarer.super.for.while$super(Unknown Source)
at com.fs.A.super.Ò00000(Unknown Source)
at com.fs.starfarer.combat.D.o00000(Unknown Source)
at com.fs.starfarer.StarfarerLauncher$2.run(Unknown Source)
at java.lang.Thread.run(Thread.java:619)
There was nothing in the log after that, and everything before was just TextureLoader stuff.