The visual freezes!

    Sep 29 2012 | 9:59 am
    Running Max 5.1 on Windows 7 64 bit.
    Around 10 minutes, I can't edit any patch anymore, the visual just freezes. Impossible to get access to any drop down menu item from the patch window, nor from the main window.
    I noticed that the only thing I can do is locking/unlocking the patch through the keyboard shortcut (Ctrl + E), and only the label "(unlocked)" appear/disappear ...
    The amount of objects created is not the issue here, and there's no third party objects running, as I've been going through the basic MAX tutorials so far.