Chrome updates sometimes turn off a protocol named npapi. If possible try using another browser if not, please use the following instructions to re-enable npapi
Please copy and paste this into your browser
Click on "enable" under "Enable NPAPI"
Then scroll to the bottom of the page and click Relaunch now
Once you relaunch go back to the page. and when you open it you may get a pop-up blocked or puzzle piece icon in the address line of the popup. Click it and choose to allow the tool to run.
This will open the tool. You should only have to do this once if you choose Always allow as the option.