sometimes wheel mouse change the behaviour

Hi. Recently I updated to 0.8.10 and since then, sometimes mouse wheel change the behavior without explanation. The expectable is doing scrolling in the screen, but, I dont know why, when or if I do anything particular, but sometimes, suddenly, the wheel begin walk across the command history in place of make scrolling and I must to close and open again the tab (session) to restore it. I just know that this happens after updating . I don't see any preference or shortcut to control the wheel behaviour, so I don't know if is a bug or maybe I can do something to avoid this problem.

Thanks.