when I swap some modules in my racks the URL shows the old configuration.
how can I update the URL view of my racks?

no answer?

That could be a cache problem. Hold down SHIFT and reload the browser.

Sometimes its cache, sometimes its not. I've often noted a problem in embedding a rack into a forum post where, if the rack wasn't previously recognized properly by the screenshot mode, it won't come up with the proper layout in the forum post. As a result, I've gotten used to always making sure that screenshot shows the right build iteration prior to embedding the rack's URL in the forum post. That always works.