For students trying to access the Math in Focus textbooks and you only see a white page where the textbook should be, you'll need to enable Flash.
Google has started depreciating Flash in the Chrome browser as it's end of life has been announced. The first step Google took was to disable Flash by default. This means that each page you visit you now have to choose to enable (run) the Flash content.
Here are the instructions for enabling Flash in Chrome per page:
Click on the i in the circle at the left end of the omni bar or the green lock (this all depends on if you are securely connected or not, varies per web site).
Example of i in circle: Example of green lock:
(Students you may see a small building instead of the "i" or "lock")
In the menu that drops down look for Flash with a current settings of Ask (default).
Click on Ask (default) and change it to Allow. Once changed you will need to reload the page. You will need to do this for each web site that Chrome blocks Flash on.
If you restart Chrome you will need to do this again. Chrome will no longer remember this setting past a restart.