Please paste the crash log in here (already in your clipboard) and, if possible, provide any information that may help to reproduce the issue.
java.lang.RuntimeException: Actor: VisTextButton: Ok
at com.badlogic.gdx.scenes.scene2d.Actor.notify(Actor.java:192)
at com.badlogic.gdx.scenes.scene2d.Actor.fire(Actor.java:152)
at com.badlogic.gdx.scenes.scene2d.ui.Button.setChecked(Button.java:125)
at com.badlogic.gdx.scenes.scene2d.ui.Button$1.clicked(Button.java:93)
at com.badlogic.gdx.scenes.scene2d.utils.ClickListener.touchUp(ClickListener.java:88)
at com.badlogic.gdx.scenes.scene2d.InputListener.handle(InputListener.java:71)
at com.badlogic.gdx.scenes.scene2d.Stage.touchUp(Stage.java:355)
at com.crashinvaders.common.PrioritizedInputMultiplexer$Wrapper.touchUp(PrioritizedInputMultiplexer.java:136)
at com.crashinvaders.common.PrioritizedInputMultiplexer.touchUp(PrioritizedInputMultiplexer.java:83)
at com.badlogic.gdx.InputEventQueue.drain(InputEventQueue.java:70)
at com.badlogic.gdx.backends.lwjgl3.DefaultLwjgl3Input.update(DefaultLwjgl3Input.java:189)
at com.badlogic.gdx.backends.lwjgl3.Lwjgl3Window.update(Lwjgl3Window.java:394)
at com.badlogic.gdx.backends.lwjgl3.Lwjgl3Application.loop(Lwjgl3Application.java:143)
at com.badlogic.gdx.backends.lwjgl3.Lwjgl3Application.<init>(Lwjgl3Application.java:116)
at com.crashinvaders.texturepackergui.desktop.ApplicationStarter.start(ApplicationStarter.java:57)
at com.crashinvaders.texturepackergui.desktop.ApplicationStarter.main(ApplicationStarter.java:35)
Caused by: java.lang.NullPointerException
at com.crashinvaders.texturepackergui.controllers.CommonDialogs$5.run(CommonDialogs.java:134)
at com.crashinvaders.texturepackergui.controllers.CommonDialogs$8.changed(CommonDialogs.java:173)
at com.badlogic.gdx.scenes.scene2d.utils.ChangeListener.handle(ChangeListener.java:28)
at com.badlogic.gdx.scenes.scene2d.Actor.notify(Actor.java:188)
... 15 more
X Error of failed request: BadAccess (attempt to access private resource denied)
Major opcode of failed request: 2 (X_ChangeWindowAttributes)
Serial number of failed request: 79
Current serial number in output stream: 80
After packing a multipage atlas, attempting to copy the pack with Ctrl-Shift-C will crash the UI.
Tested by packing all the images in PNGs.zip