I had a class defined as a Mixin - which is still in the help for Import_Class_Protocol. And I've been using this since 3.1d, but 17.1 Problem Resolution complains about External Reference to superclass 'Mixin'. Verify that t correct Use declaration is present ....

I can change it to a cObject (which as I remember is the Mixin class) and the complaint goes away.

Just thought you should know ...