Did you try selecting the checkbox "Disable Linestipple and polygonstipple" in the Preferences?
Also, did you try starting with the "Safe Mode" version?
Start with the first, then try Safe Mode after....
Please create only one user account per person. The only exception is if you need a separate organization account; organizational accounts need to use your organization domain.
Registering? We send an activation email. Your account is not activated until you activate it using the email link.
Go to Support Center >FAQ for more information.