This is on Spark 2.5.5 beta 1. I cannot open the chat window. Spark has been open for over a day (and was running fine). I looked in my log file and now whenever I try to chat, I see the following stack traces: Exception in thread "AWT-EventQueue-0" java.lang.IllegalStateException: Timer already cancelled. at java.util.Timer.sched(Unknown Source) at java.util.Timer.scheduleAtFixedRate(Unknown Source) at org.jivesoftware.spark.util.TaskEngine.scheduleAtFixedRate(TaskEngine.java:225) at org.jivesoftware.spark.ui.rooms.ChatRoomImpl.<init>(ChatRoomImpl.java:192) at org.jivesoftware.spark.ChatManager$1.finished(ChatManager.java:317) at org.jivesoftware.spark.util.SwingWorker$2$1.run(SwingWorker.java:136) at java.awt.event.InvocationEvent.dispatch(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source) Exception in thread "AWT-EventQueue-0" java.lang.IllegalStateException: Timer already cancelled. at java.util.Timer.sched(Unknown Source) at java.util.Timer.schedule(Unknown Source) at org.jivesoftware.spark.util.TaskEngine.schedule(TaskEngine.java:103) at org.jivesoftware.spark.UserManager$4.windowDeactivated(UserManager.java:480) at java.awt.AWTEventMulticaster.windowDeactivated(Unknown Source) at java.awt.AWTEventMulticaster.windowDeactivated(Unknown Source) at java.awt.Window.processWindowEvent(Unknown Source) at javax.swing.JFrame.processWindowEvent(Unknown Source) at java.awt.Window.processEvent(Unknown Source) at java.awt.Component.dispatchEventImpl(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Window.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.KeyboardFocusManager.redispatchEvent(Unknown Source) at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(Unknown Source) at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source) at java.awt.Component.dispatchEventImpl(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Window.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.SentEvent.dispatch(Unknown Source) at java.awt.DefaultKeyboardFocusManager$DefaultKeyboardFocusManagerSentEvent.dispatch(Unknown Source) at java.awt.DefaultKeyboardFocusManager.sendMessage(Unknown Source) at java.awt.DefaultKeyboardFocusManager.dispatchEvent(Unknown Source) at java.awt.Component.dispatchEventImpl(Unknown Source) at java.awt.Container.dispatchEventImpl(Unknown Source) at java.awt.Window.dispatchEventImpl(Unknown Source) at java.awt.Component.dispatchEvent(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.SequencedEvent.dispatch(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source)