API no longer functioning in SW 2015

Greetings,

We recently moved from SW 2013 SP02 to SW2015 SP02 and have a problem with a fairly simple API:

        swapp = GetObject(, "SldWorks.Application")

        Doc = swapp.ActiveDoc

        DocExt = Doc.Extension

        CustProp = DocExt.CustomPropertyManager("")

        Title = Doc.GetTitle

        txtDocNumber.Text = Doc.CustomInfo2("", "Number").ToUpper

This code pulls the attributes from the Solidworks part and populates a form. It is a Custom Properties tool.

This functioned fine in the previous version but now nothing.

Any assistance or enlightenment would be most appreciated!

Danny Bradford

SolidworksApi macros