I use hardware mouse (because otherwise the pointer disappears) and if I mouse over some buttons, a pop-up help appears, e.g. "research screen" pop-up over the research screen button. This pop-up continue to stay there, even after I remove the mouse pointer. It disappears only if I move the mouse pointer over other button, like the end of turn. This is really annoying! I did not check if the software mouse have the same problem.
