Could you tell me a little bit more about the conditions under which this error occurs? Specifically, what operating system and browser settings you are using with KNIME. (Are you using the bundled Chromium browser or SWT browser for example?) If you need help checking, let me know and I can tell you where to find these settings.
Also, are there any errors shown as popups when the view begins to open? You can also look in the KNIME console to see if there are any messages which could provide more information and link them here.
Lastly, if possible, attaching the workflow you are using would be very helpful so I can see if I can reproduce the error locally.
Thanks for the feedback; hopefully we can find the cause of the problem and get it fixed