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I signed up for the ThingWorx Studio 90 day trial, I installed the desktop app, the experience server was setup.
When I launched the desktop app and started the application, a localhost browser window opened in Chrome and was stuck at the loading screen as below :
It seems Studio is not running at all.
The loading screen that you show is just a browser window showing that the application itself is not running properly.
Can you please make sure it runs? (taskbar icon).