Cursor freezes up randomly on Thinkpad W510

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http://crunchbang.org – Waldorf 11 is causing my cursor to freeze up every so often. If I drag my finger up or down the touchpad, the cursor doesn't move, but the page (when I'm using a webpage) scrolls in the opposite direction. This hasn't happened with any previous stable/unstable version of #! (am using 2012-10-15). Pointing stick works fine even when cursor freezes up. (HowTos)