Hello
So I tried to open the reactor menu on a bare ship (core and grey hull that's all) via the radial menu, it automatically crash my world in single player, when trying to connect to it the world again, I have the message that the world is corrupted, and I unable to connect to it, the only solution is to erase it.
I can try to provide a back up of the world, but it's easy to reproduce.
http://image.noelshack.com/fichiers/2017/40/3/1507118258-crash.png
Crash
Stacktrace
[java.lang.RuntimeException: No Tree: 0 at org.schema.game.client.view.gui.reactor.GUIReactorPanel.getSelectedTree(GUIReactorPanel.java:443) at org.schema.game.client.view.gui.reactor.GUIReactorPanel$6.toString(GUIReactorPanel.java:291) at org.schema.schine.graphicsengine.forms.gui.GUITextOverlay.setTextSimple(GUITextOverlay.java:824) at org.schema.schine.graphicsengine.forms.gui.newgui.GUIHorizontalButton.init(GUIHorizontalButton.java:44) at org.schema.schine.graphicsengine.forms.gui.newgui.GUIHorizontalButton.<init>(GUIHorizontalButton.java:58) at org.schema.schine.graphicsengine.forms.gui.newgui.GUIHorizontalButtonTablePane.addButton(GUIHorizontalButtonTablePane.java:88) at org.schema.game.client.view.gui.reactor.GUIReactorPanel.createReactorSelect(GUIReactorPanel.java:284) at org.schema.game.client.view.gui.reactor.GUIReactorPanel.createTreeTab(GUIReactorPanel.java:219) at org.schema.game.client.view.gui.reactor.GUIReactorPanel.onInit(GUIReactorPanel.java:127) at org.schema.game.client.view.gui.reactor.ReactorTreeDialog.<init>(ReactorTreeDialog.java:21) at org.schema.game.client.view.gui.RadialMenuDialogMain$10.callback(RadialMenuDialogMain.java:175) at org.schema.game.client.view.gui.RadialMenu$1.callback(RadialMenu.java:91) at org.schema.game.client.view.gui.RadialMenuItem$1.callback(RadialMenuItem.java:63) at org.schema.schine.network.client.GUICallbackController.execute(GUICallbackController.java:64) at org.schema.schine.input.BasicInputController.updateInput(BasicInputController.java:234) at org.schema.game.client.controller.GameClientController.updateStateInput(GameClientController.java:1465) at org.schema.schine.graphicsengine.core.GLFrame.doFrameAndUpdate(GLFrame.java:673) at org.schema.schine.graphicsengine.core.GraphicsContext.mainLoop(GraphicsContext.java:828) at org.schema.schine.graphicsengine.core.GraphicsContext.startUp(GraphicsContext.java:725) at org.schema.game.client.controller.GameMainMenuController.startGraphics(GameMainMenuController.java:1148) at org.schema.game.common.Starter.startMainMenu(Starter.java:1457) at org.schema.game.common.Starter.main(Starter.java:1001)
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-validated-
Another person had a similar (if not the same) issue where opening the inventory caused the JVM to not respond anymore. Will provide extra info later.
Your world is most likely not corrupted though, just still running in the background as it failed to shut down properly. Next time you have this, and it doesn't shutdown after waiting for a while, open up your task manager and look for any javaw.exe processes running. End the one that remains if you have no other java programs running, that should be your world still running in the background.
The radial menu "reactor" is usable/visible even if you don't have the new reactor system on your ship, causing this crash. There may be another reason why it happens though as mentioned in T2564.
Will treat this one separately as I suspect there are multiple causes.