Duik Character Rig Warp/broken when reopening saved project

Hi all,

This morning I rigged a simple character using Duik v. 15.07. No animation has been added to the rig just yet, I saved the project went away for a few hours and reopened the project later and was greeted with this. I have done two other rigs today and they seem to be fine. What is this, is it fixable or do I need to re-rig.

Thanks

Jonty