This is more than likely not a bug, just an issue.
When you load my game at: https://www.TheAlphaCompany.net/u-boat-with-friends
You always get the update, and when it's complete, you're asked to refresh your browser. -- Works great, no problems.
But when you try to access the game from the Facebook Canvas:
It does not know that there is an update required.
When users connect to my server, even with a bad version they are notified. But currently the only way to remedy is to send them to this address to get the latest update:
Has anyone else encountered this problem, and know of a workaround so that facebook users get the updated app easily without leaving that canvas?