I'm not sure if this is still reproducable with Qt 5.3.0, but the upstream seems to point to the libxcb upstream bug which now has a fix. Another Qt bug linked to the upstream Qt bug report was also reported fixed in Qt 5.3.0.
** Package changed: qtdeclarative-opensource-src (Ubuntu) => libxcb (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1179617 Title: qmlscene assert failure: qmlscene: ../../src/xcb_conn.c:180: write_vec: Assertion `!c->out.queue_len' failed. To manage notifications about this bug go to: https://bugs.launchpad.net/qt/+bug/1179617/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs