Maybe check out the hidden Absolute Mouse Mode option? Sounds like your new computer's mouse driver is behaving strangely, and that option may help (it's not JUST for tablets/pens):

    TravisSpomer 4 years ago
    I'm having the exact same problem, and setting Absolute mouse mode did not help.

    * Edit

    I got it working again after updating the trackpad driver and using the absolute mouse mode.
    toand 4 years ago
    i have that issue also, where do i find the hidden mouse mode options.

    Thank you! the hidden mouse mode fixed my problem!
    Bleach 4 years ago