"Workbench could not be saved." - Dynamo

Is there info regarding the Dynamo error: "Workbench could not be saved." when using a 'Loft Form' node ?

.dyf's and .dyn's cannot seemed to be saved if this node is used. any ideas ?

Thank you

We have seen that recently but have not nailed down the cause. There is an open issue here https://github.com/ikeough/Dynamo/issues/67 please add any information you have there.

While saving a new .dyn (named asd) with only the Loft Form node in the workspace, this error occurs:

Saving C:VasariWIPBeta-1Dynamodefinitionsasd.dyn...
The '+' character, hexadecimal value 0x2B, cannot be included in a name.
at System.Xml.XmlDocument.CheckName(String name)
at System.Xml.XmlElement..ctor(XmlName name, Boolean empty, XmlDocument doc)
at System.Xml.XmlDocument.CreateElement(String prefix, String localName, String namespaceURI)
at System.Xml.XmlDocument.CreateElement(String name)
at Dynamo.Controls.dynBench.SaveWorkspace(String xmlPath, dynWorkspace workSpace)
Workbench could not be saved.

This error occurs even with working inputs and a successful output surface, just cannot save.

Does anyone have any ideas?