URLs in LibGuides v2 have changed slightly. URLs in the old format will work for a few weeks after go-live but you need to make sure you find and update any old links over the next few weeks.
This is what you are looking for-
Old LibGuides link:
New LibGuides link:
If you see any link which contains the phrase ‘content.php’, update it.
How do you find these links? They will probably occur where you are linking from one guide to another. The best way to see if your link is in the old style is to hover over the link and look at the URL in the bottom left hand corner of your browser.