Having a similar issue. Using Fusion 360 in my classroom. Students (and me) are experiencing freezing when adding a drawing to a title block. It has happened at the exact same moment at each instance. The title block has loaded, the base view is still attached to the mouse, when the scale is changed - it freezes. Absolutely nothing on the screen is operable. Closing the browser, shutting down the computer... after logging in again - it's on the same frozen screen. It seems to resolve after 7-8 hours of not being usable - from class time to after dinner time is a typical spread of freeze.