Openroads point controls and parametrics stopped working

Hi, 

I am 90% done with a model and suddenly can't make any edits to my corridors anymore. 
Whenever I try to add a point control or parametric, it appears to process the corridor but then just crashes. It's almost as if the software has reached the limit of point controls that can be added to the corridor.

I have tried copying a different point control & parametric and then editing that but it doesn't allow me to do that either. 

Has anyone come across this before or know of a different workaround?

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