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I saw segmentation violations each time I ran SwingSet2 on a particular 64-bit Linux machine. Each time, I'd go through a few (or all) tabs on the Java l&f, and then switch to GTK. The switch to GTK was slow, and the GUI was sluggish after that. Then, after a bit of playing with different tabs, I'd get a SEGV. I got the SEGV all 3 times I tried running SwingSet2. Here's a typical error message: # # An unexpected error has been detected by HotSpot Virtual Machine: # # SIGSEGV (0xb) at pc=0x00000039eca1289d, pid=19695, tid=1088211296 # # Java VM: Java HotSpot(TM) 64-Bit Server VM (1.6.0-ea-b53 mixed mode) # Problematic frame: # C [libgobject-2.0.so.0+0x1289d] The SEGV happened with both the Swing b53 integration build and the most recent master build (without Swing's b53 changes).