All tools won't work

Hi. In the latest version of Photoshop, after a bunch of minutes in which the app seems to work flawlessly, the interfaces stops working. I can't pan nor zoom or use the brush, I can't even make adjustments or undo with ctrl+z. Well, technically I can press the buttons (the application doesn't freeze, I can access the preference panel, brushes and in general all internal windows), but they don't give any output. It's like the window that displays the current artwork freezes and does not display the changes that I make. How can I solve this problem? Thanks.