We work from two computers, both MACs - on one of them it happens sometimes that when we try to get a photo from the Media Library, or even try to work using the Visual Editor it just does not respond. We can see all the icons but when we click on it nothing happens. Working with HTML editor does not seem to be a problem. It is happening on different sites that use WordPress version 3.3.1. On the other computer this is not a problem at all. Can anyone help us figure out the problem?