The plugin must have crashed. I am working on improving the feedback the plugin gives you as a user so you know what is happening. If you turn on the Obsidian Developer Tools and looks at the console, you should see an error message in the console.
If you send me your My Clippings file, I can try and load it locally on my machine and debug why the plugin is unable to parse it. I recently found an issue that the plugin could not load Chinese My Clippings file, and I had to make it Chinese aware. Your file might have another use case that I haven’t encountered before too.
You can send me your file on hadyos@gmail.com if you don’t mind sharing your highlights.