On 05/09/2016 04:32 PM, Khanh Tran wrote: > Program received signal SIGSEGV, Segmentation fault. > 0x00007fffdd8aa7e2 in ?? () from > /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms/libqxcb.so > (gdb) I didn't see the output from: thread apply all bt at the (gdb) prompt. -- Bill