The most common problems are 404 Errors, which means Page Not Found...
This usually means you have entered a broken link, or you haven't entered the FULL URL. If you don't include the http:// or https:// part, your links will not work. (We recommend using https:// links as some websites will only load the link if you use the secure version!)
Other issues are typos or spaces, or incomplete links... if you're copying-and-pasting links, make sure you always get the full thing. If you've checked all that and are still having troubles, please do reach out with the link and your rotator link so we can check it.