SYMPTOM:
Some architect users get the following error when attempting to open Warehouse Catalog in Strategy Desktop 9.x/10.x:

Unexpected Error. 'Text' property is read-only

Note: Even if the user has the architect privilege 'Bypass schema objects security access checks', database connection is a configuration object, which is why this privilege does not applied.
ACTION:
Grant at least "View" privilege at the user or group level to this database connection object by going to its Properties > Security within the Database instances window.