Single Exchange 2013 CU6 on Server 2012 R2 in coexistence with Exchange 2007 during migration.
Having a problem with OWA on Exchange 2013. When clicking on the People or Tasks tab they never load just say loading. Also unable to enter certain settings from the settings menu like Change Theme, Display Settings, Offline Settings; the browser doesn't do anything when those links are clicked. Composing an email in HTML doesn't work either; unable to type in the email body (no cursor or Font Styles bar) and changing to Plain Text allows user to type in the email body. This behavior is the same across IE11, Chrome 38, Firefox, Safari. Seems to be a problem with OWA premium as OWA light on an XP machine with IE8 doesn't have any of the above problems. OWA works fine in Exchange 2013 CU4 in our lab environment.
Thanks for any suggestions as I am banging my head against the wall with this.