Michael,
I think you can change db.php, around line 70, you need to alter the upcoming section to use the WordPress current_time function, instead of the system date. I don’t know if the syntax is correct, but I think this is the right spot.
My host uses GMT, but my word press is set to pacific time, that’s a significant difference.
else { // upcoming
// get only events in the future
// $range_start = date( ‘Y-m-d’ );
$range_start = date( ‘Y-m-d’, current_time( ‘mysql’ ));
$range_end = ‘9999-12-31’;
}