Just confirming I am also affected by this bug since upgrade to Utopic; I usually see it start upon click-drag in Firefox (35.0.1), and it happens using a couple of external mice or the touchpad. Only left pointer is responsive; log out and back in resets the problem but it re-occurs right away. This is a clean upgrade from Trusty with no broken packages etc. on a fully up to date BIOS etc.
Just confirming I am also affected by this bug since upgrade to Utopic; I usually see it start upon click-drag in Firefox (35.0.1), and it happens using a couple of external mice or the touchpad. Only left pointer is responsive; log out and back in resets the problem but it re-occurs right away. This is a clean upgrade from Trusty with no broken packages etc. on a fully up to date BIOS etc.