I sure eventually, someone will make an extension, app, or release code that will show the amount of dislikes again even if YouTube decides to implement this.
Go to the processes tab in task manager and see what it causing it. It might just be something that is running in the background that you didn't know about. Also, you should be able to end the task through there.
Edit: More information
I am assuming you are using Windows. So have you tried it with other media players such as Media Player which comes installed on Windows because personally, I believe VLC sucks.