For years, remote management has been working in our system. Now, after
installing the client 4.91 sp3 and Zen 7, we get an error message:

1487: You are attempting to launch the operation from an obsolete or
invalid workstation object. Verify that the workstation object is valid.

We can delete the object in C1 and it appears after the reimport.

There is document on it in the Knowledge Base, but I have double checked
all the settings and compared them to ones that do work with RC/RV.

Any suggestions.