This may have already been noted elsewhere, but I tried to use SketchUp Free this morning for the first time since Chrome implemented its aggressive ad blocker on February 15th. This is the message I received when I tried to access any of the auxiliary functions:
While I could simply enable all popups, I would recommend the following steps:
Click the 
symbol at the top right corner of the browser (if you haven’t upgraded yet, there may be an odd symbol there instead). Select “Settings” and then 
at the bottom of the Settings screen. Under “Privacy and security”, expand the “Content settings” option:
Expand the “Popups” settings:
Click the “ADD” option under “Allow”:
Enter a wildcard match as shown for all things SketchUp:
Click 
and verify the new setting:
Exit the settings and refresh the SketchUp Free page … now the popups work for SketchUp, but are still blocked for everything else:
