Timezone Issue with BuddyPress Group Calendar

The widget for upcoming events seems to be looking at UTC time instead of the UTC -6 timezone configured in Wordpress Settings > General. As a result, upcoming events are disappearing from widget 6 hours before they should. Note that when I edit an event, the activity log shows the edit time in UTC time instead of UTC -6. Are there any other settings I need to tweak to make the calendar work correctly? Thanks for your help.