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Created attachment 130035 [details] Thread Dump Found one Java-level deadlock: ============================= "Folder Instance Processor": waiting for ownable synchronizer 0x00000000d07c5bf0, (a java.util.concurrent.locks.ReentrantLock$NonfairSync), which is held by "AWT-EventQueue-0" "AWT-EventQueue-0": waiting to lock monitor 0x00007f1530d1df50 (object 0x00000000d07c75f0, a sun.awt.PostEventQueue), which is held by "Folder Instance Processor"
It happened just once. I cannot reproduce it.
AWT synchronization bug. Upgrade to latest JDK.
*** This bug has been marked as a duplicate of bug 213926 ***