Ebook Central SSO login mechanism relies on McGill authentication cookies to permit access. Similar to the preceding question, sometimes these cookies expire, especially when your connection to Ebook Central times out.
You can follow the links in the preceding question to information on deleting cookies for your browser, but note that you will only need to search and remove cookies associated with 'mcgill.ca' to resolve this problem. You should not need to delete any other cookies or data.
Alternatively, you can browse in 'private' or 'incognito' mode. Here are instructions for how to use this option: Chrome, Firefox, Safari, Microsoft Edge.
