Thanks Ben, that confirms what we suspected and gives us a tool to try and remedy the situation if (as we suspect) the supplier of the "interfering" system isn't very interested in fixing something affecting a tiny number of developers!

Auto-adjust / design question 4: we'd find this useful, especially if it handles bulk renames - a bunch of classes implementing a data type, all being moved in one go from one place in the class hierarchy to another and all being consistently renamed.

So files X/Y/A.cls, X/Y/B.cls, X/Y/C.cls, and containing classes X.Y.A, X.Y.B, and X.Y.C being moved to Q/P/A.cls and Q.P.A etc. Especially if Properties defined in X.Y.A as "Property pp As X.Y.B" becomes "Property pp As Q.P.B" when renamed.