Upgrade to 5.0.13 has broken calendar sharing

[launcap]

Hi,

I ran the 5.0.13 upgrade a week or so back (originally was on 5.0.9) and it appears to have broken the ability to share calendars with guest-only rights. All the accouns I created since the upgrade cannot add a guest viewing right - the UI lets me but the share is never created and Outlook users get a "object cannot be found" (or no error message at all).

Any ideas?

Cheers,
Phil