And it was working fine. But, probably coincidentally, after performing an upgrade to the plugins my calendar on my server also got wiped. I’m just wanting to read my calendar and not write to it… so just checking this isn’t possibly happening?
I’m not sure what might have happened on your calendar on your server, but ICS Calendar can’t be at fault. The iCalendar (ICS) protocol is inherently read-only; ICS Calendar has no way to write anything to the calendar server.
I’m not sure how CalDAV may fit in here — ICS Calendar doesn’t support CalDAV at all. As for the Basic Authentication… we’re still dealing with an iCalendar subscription, so again it’s inherently read-only. There’s no way to write anything to the server.