Thanks, yes, we have tried those but they don't entirely fit the problem. The issue is that we want to read the context's current values when the file opens (without retrieving any data).
The first option (refresh on file open) immediately retrieves data, which we don't want to do on opening the file... we just want any cell that has an EPMContextMember() function to update and pull in the current context member. The second option (refresh on context change) again pulls in data when the context changes, but I'm looking just to read the context's value when the file is opened.