When viewing the month-view, days that have multiple events scheduled seem to run together. Some events may be more than one line long and just blend in with all the other events?
Add a bullet to the beginning of each event so as to distinguish and seperate the different events.
Open piCal.php and do a search for the following line of code (note that the string below is only the begiinning part of the line and should result in only one hit.)
$event_str_tmp = "<a href='$get_target?smode=Monthly ;
Remove the entire line of code and replace it with the following
$event_str_tmp = "• <a href='$get_target?smode=Monthly&action=View&event_id=$event->id&caldate=$this->caldate' style='font-size:10px;font-weight:normal;text-decoration:none;'>$summary</a>" ;