I am experiencing the same effect and have added a screen shot at bug 998125
I performed some further investigation and it seems to me thet the error appears especially when you click on the tick mark besides a header line ("Important security updates", "Recommended updates", etc.). Right clicking on a tickmark and choosing select all or deselect all usually did not trigger the error.
I am experiencing the same effect and have added a screen shot at bug 998125
I performed some further investigation and it seems to me thet the error appears especially when you click on the tick mark besides a header line ("Important security updates", "Recommended updates", etc.). Right clicking on a tickmark and choosing select all or deselect all usually did not trigger the error.