That is when the game will try to load a save file. So maybe file access permission were denied.
What version of the game are running? desktop or html5?
What is your operating system and browser(if you used the html5 version on this page).
Viewing post in OL vs Cocks of the Dead comments
I never used chrome os before, I can only spitball potential issues.
Try changing the permission for this site. See if cookies and file editing is allowed.
https://support.google.com/chromebook/answer/114662
If that doesn't work, open the dev console and then play the game, see if there is any error log.
https://developer.chrome.com/docs/devtools/open/
If your chromebook is locked down and can't access the dev console, then I have no idea what to do.