I read Kindle books from my Library on Kindle Cloud Reader through my Macbook Pro. It has been fine until today when the books open but "freeze" - i.e. the pages can't turn. If I go to Contents of the book it fails to load and a sign declares Error Try Later. This just keeps happening. The books are fine reading on my Samsung phone. I have restarted the Mac 4-5 times. Everything else works but not Kindle Cloud Reader on this Mac. I have restarted Firefox. I have not changed any settings. I don't understand this problem. Kindle Cloud Reader works on the phone but since this morning the books "freeze" and the pages don't turn. When I could not access the books before Amazon confessed to having a system breakdown (early December) - but the Kindle KDP Suppport have just said there is not problem currently. Could this be a browser problem - or with the settings?