Crystal Report Graph Not Visible

I am using Visual Basic 6.0 with Crystal Reports 8.0 to take a sample of downtime data over a finite period and display a list of the downtimes as well as a pie chart and graph of the downtimes. (I attached a Word export of this file for reference.) Some of my users are able to get the text in the report, but not the graphs. There isn't any error, just no graphs. The only correlation I have found is this:

The dates are selected by clicking in a text box that brings up a MonthView control. The users then click a date on that MonthView and the program formats the date to the needed value. In a few cases, when the program tries to open the form with the MonthView, it errors out saying mscomct2.ocx was missing. I am able to manually copy and register (using regsvr32) this file and the MonthView works fine. However, in every case that a user had this problem, he/she also has the problem with no graph displaying. I am certain I am missing another OCX or DLL, but I have no idea what it might be. Any ideas?