first update or reinstall your tablet drivers.
if that fails, reset your animate preferences*
* remove C:\Users\<username>\AppData\Local\Adobe\Animate CC 2017\ and
nether work, no matter what the stylist refuses to stay over the animate window.
check other threads in this forum for tablet issues and solutions.
if none of those work for you, using a browser that allows popups and cookies, contact adobe support during pst business hours by clicking here and, when available, click 'chat', http://helpx.adobe.com/x-productkb/global/service-ccm.html