HTML5 Webstorage and GPO

I'm trying to troubleshoot a webapp, which uses LocalStorage to store a user's username (an email address) between (sessions) logins. The used method conforms to HTML5 specs: http://www.w3schools.com/html/html5_webstorage.asp

The problem I'm facing is that on a number of workstations in the same hospital organisation this doesn't work.

Is there any GPO settings that could affect a user's local storage, and preventing the webapp to store the last username? Also, any resources documenting these specific GPO settings would be useful.

Thanks,

M