I'm starting with VSC 5.0 installation in our vSphere 5.5.0 environment. After successfully adding a storage system (7-mode filer) into VSC, I can "Enable Editing" by inserting credentials and configure provisioning details subsequently. When accessing that dialog later again through "Modify" action I'm immediately getting the following error:
When I close this error message and attempt to "Enable Editing" again, the dialog stuck, cannot click "OK".
Also I've noticed the "Configuration -> Set Default Credentials" is always reset to user "root" after restarting VSC service even when I changed it to different user/password earlier.
I have exactly the same issue. The Datastore provisioning was trying to use the wrong interface to share so I went in to edit, was forced to use root, modified and saved and still had the same issue. Tried to go back in and see if my changes really took place and then I get exactly the same dialogue as yours.