Here is a backtrace of gtk-window-decorator when the decorations are missing:
(gdb) backtrace #0 0x00922416 in __kernel_vsyscall () #1 0x0107edf6 in __poll (fds=0x1116ff4, nfds=6, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:87 #2 0x00971a1b in g_poll () from /lib/libglib-2.0.so.0 #3 0x0096443c in ?? () from /lib/libglib-2.0.so.0 #4 0x00964ba7 in g_main_loop_run () from /lib/libglib-2.0.so.0 #5 0x004861d9 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0 #6 0x08055ccb in ?? () #7 0x00fd3ce7 in __libc_start_main (main=0x8055410, argc=2, ubp_av=0xbf9d27f4, init=0x8058620, fini=0x8058610, rtld_fini=0x347ac0 <_dl_fini>, stack_end=0xbf9d27ec) at libc-start.c:226 #8 0x0804cb01 in ?? () -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/577482 Title: Window decorations are sometimes missing after login -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs