External Axis Wizard issue in 5.60

    I have created a system with a 6700 and a 500C in RobotStudio 5.60. I have added two MTD250's and am trying to use the external axis wizard to make them usable. When I select them and click NEXT I get an Unhandled Exception. You can see the error in the attachment.

     I have also tried making the system from layout, and if I select all of mechanisms (robot, 500C, and both MTD's) it tells me that the "Number of positoners in a system are exceeded" and if I de-select one then it tells me that the combination ofrobots and positioners  isn't supported.

 Any ideas on how I can get around this? I need to do the system with a 6700, so using 5.15.02 is not an option.

Thanks!

Nick Lessard