While developing our solution for truss modelling in Autodesk® Revit® Truss+ RT we have come up with some fixes that let users use the solution more stably. There were some issues with Revit® 2014, especially with metal trusses due to Revit's limitations to minimum lengths.
We've found that with certain conditions faces of Revit® families reach the minimum length of 1/32 in. (0.8 mm) allowable by Autodesk® Revit® and cause families to collapse. We've done a workaround and put the entire package to the Update to avoid this issue.
We've updated Revit® truss families and Truss+ RT itself. For stable use of it, use the new Revit® trusses that come with new Truss+ RT update ONLY.