Update 6 - Not backwards compatible !

Hey again,

We've just figured out the hard way that the latest version of ProSteel Update 6 does not work with previous versions of ProSteel (Update 5 has been tested to not work).
A model was completed from start to finish using ProStructures Update 6, a user has tried to open this model using Update 5 it crashes every time (we have tried two different Update 5 versions)
Update 5 can Reference in the model, but it loses its ProStructures elements and everything turns to Solids (even copying / pasting the elements they are still just Solids instead of ProStructure elements)

Can we please get this tested.