rqt segmentation fault following tutorials

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Hi everybody

I just installed ROS Kinetic Kame on Ubuntu 16.04 following the tutorials. When I get to the 6th beginner tutorial (Understanding ROS Topics, http://wiki.ros.org/ROS/Tutorials/Und... ), at 2.1, when I try to run rqt_graph, I get the message "Segmentation fault (core dumped)". This also happens when running rqt directly.

I've been looking around for a solution, but I did not find anybody with this problem. I have tried reinstalling both ROS and rqt packages, but it didn't make any difference. Besides, the wiki page for rqt ( http://wiki.ros.org/rqt ) throws an "Internal Server Error", so I cannot get much info.

Any help would be appreciated. Thanks a lot

** Update 1: already updated Qt, no changes

** Update 2: here is the gdb:

(gdb) run /opt/ros/kinetic/bin/rqt
Starting program: /usr/bin/python /opt/ros/kinetic/bin/rqt
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffe72f0700 (LWP 7034)]
[New Thread 0x7fffdd857700 (LWP 7035)]
[New Thread 0x7fffdd056700 (LWP 7036)]
[New Thread 0x7fffdc855700 (LWP 7037)]
[New Thread 0x7fffcf675700 (LWP 7039)]
[New Thread 0x7fffcee74700 (LWP 7040)]

Thread 1 "python" received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()

(gdb) backtrace
#0  0x0000000000000000 in ?? ()
#1  0x00007fffccf5a337 in ?? () from /opt/ros/kinetic/lib/python2.7/dist-packages/qt_gui_cpp/libqt_gui_cpp_sip.so
#2  0x00007fffef322811 in ?? () from /usr/lib/python2.7/dist-packages/sip.x86_64-linux-gnu.so
#3  0x00007fffef31f642 in ?? () from /usr/lib/python2.7/dist-packages/sip.x86_64-linux-gnu.so
#4  0x00000000004b670c in ?? ()
#5  0x00000000004b0cb3 in PyObject_Call ()
#6  0x00000000004c9faf in PyEval_EvalFrameEx ()
#7  0x00000000004c2765 in PyEval_EvalCodeEx ()
#8  0x00000000004de6fe in ?? ()
#9  0x00000000004b0cb3 in PyObject_Call ()
#10 0x00000000004f492e in ?? ()
#11 0x00000000004b0cb3 in PyObject_Call ()
#12 0x00000000004f46a7 in ?? ()
#13 0x00000000004b670c in ?? ()
#14 0x00000000004b0cb3 in PyObject_Call ()
#15 0x00000000004c9faf in PyEval_EvalFrameEx ()
#16 0x00000000004c9d8f in PyEval_EvalFrameEx ()
#17 0x00000000004c9d8f in PyEval_EvalFrameEx ()
#18 0x00000000004c9d8f in PyEval_EvalFrameEx ()
#19 0x00000000004c9d8f in PyEval_EvalFrameEx ()
#20 0x00000000004c9d8f in PyEval_EvalFrameEx ()
#21 0x00000000004c2765 in PyEval_EvalCodeEx ()
#22 0x00000000004ca099 in PyEval_EvalFrameEx ()
#23 0x00000000004c2765 in PyEval_EvalCodeEx ()
#24 0x00000000004ca099 in PyEval_EvalFrameEx ()
#25 0x00000000004c2765 in PyEval_EvalCodeEx ()
#26 0x00000000004c2509 in PyEval_EvalCode ()
#27 0x00000000004f1def in ?? ()
#28 0x00000000004ec652 in PyRun_FileExFlags ()
#29 0x00000000004eae31 in PyRun_SimpleFileExFlags ()
#30 0x000000000049e14a in Py_Main ()
#31 0x00007ffff7811830 in __libc_start_main (main=0x49dab0 <main>, argc=2, argv=0x7fffffffdcd8, init=<optimized out>, fini=<optimized out>, 
    rtld_fini=<optimized out>, stack_end=0x7fffffffdcc8) at ../csu/libc-start.c:291
#32 0x000000000049d9d9 in _start ()
(gdb)