If the Add/Edit dialog box appears and you do not get the error message, this will prove the issue is with your local macros, not the OCLC macros. To fix this, run a recompile on your macros. Select the Macro > Generate > Edit, click the checkmark, and the message will appear on the bottom left of the screen to let you know if the recompile was "successfully completed." If it was not successful, then the macro is corrupted and needs to be uninstalled and reinstalled.
If you get the same error message with the OCLC macros and your local macros, we suggest that you have your IT department uninstall and then reinstall Connexion Client on your workstation.