Strange. Then I’m not really sure what could be causing this. The only other thing I can suggest would be to write a script that simply opens a browser instance, then manually navigate to that page in your app. I suppose there could be javascript events that aren’t being triggered properly depending on how you are clicking on elements.
Also check that the user you are using has appropriate permissions per your user management system. I’m sure you’ve done this already, but I would double-triple check.