corrupt .rdp?

I have been working on a 6 mile corridor in Roadway Designer/Corridor Modeler for a year now when I attempted to import Plan Graphics the other day and Microstation crashed.  I have 15 alignments I wish to store, and they used to import just fine.  Now it will scroll through the list and hit a certain one or two and crash, error of the following...

I have tried deleting the line items that appear to be causing the crash, and I can get it down to 10 alignments and import ok.  I then tried to re-add them to the list, but again, it will crash.  At this point, rebuilding my .rdp would undoubtedly lead to oversights and errors in my model.  HELP!!!  Welcome all ideas!!