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 Always allow on this site. Once changed you will need to reload the page. You will need to do this for each web site that Chrome blocks Flash on.
Alternately you can choose to always enable Flash.
(Since the end of life of Flash has been announced this is not the option I recommend.)
To always allow Flash click on the Chrome menu (3 dots) then click on Settings.
Scroll down and click on Advanced at the bottom of the basic list.
Scroll down and click on Content Settings.
Find Flash in the list and click on it.
Make sure Allow sites to fun Flash is on and Ask first is off. The slider at the right end is on and off. Should look like this:
Close the settings tab, Flash is now allowed by default.