I am also experiencing this issue, using an Outlook ICS calendar.
I created an event as an All-Day Event in Outlook.
When I import, the event shows up in TEC calendar over 2 days.
If I edit that event in TEC, All Day Event is checked off correctly,
but the End Date / Time is set to the next day.
Would downgrading to 4.1 rectify this?
If so, can you please enable this for my account?
thanks.