[Lizard]

"{@MilestoneReportName@}" is a token that should get replaced by the name of the file that has the .jpg of the gantt chart. This was used in OmniPlan 1.0, but we realized a bug with it (which may or may not be related to what you're seeing). So in 1.1, we don't use it any more, and if you need to take it out of any customized templates you may have. Instead, we are now using {@GanttChartPath@}.

Make sure that you use 1.0 templates with 1.0 and 1.1 templates with 1.1. If that doesn't resolve your issue, it'd probably be easiest for you to contact support (omniplan@omnigroup.com) so we can do some more focused detective work.