[Plugin: SP Courseware] Date Assigned not Saving / Assignments displaying on wrong schedule

I’m having trouble with the Assignments. I have two schedule entries, Week 1 4-8-09 and Week 2 4-15-09. When editing or creating an assignment the “Date Assigned (optional)” field is always blank. (If I choose a date from the drop down and save/publish the entry that field is not saved, stays blank). Also, if I mark an assignment as due Week 2, it shows up in week 2 (when I want it to show up in the week it was Assigned – Week 1).
The class schedule can be seen here.

https://www.ads-software.com/extend/plugins/scholarpress-courseware/