1. Click on the Menu icon in the top-right, then Tools, and then click on Clear browsing data... Alternatively, you can press Ctrl (Mac: Command), Shift, and Delete at the same time on your keyboard to bring up the same dialog.
2. From the Clear browsing data screen, change the "obliteration" time to the beginning of time. Ensure that Delete cookies and other site and plug-in data and Empty the cache are selected. You may also want to select Clear browsing history.
3. Click on Clear browsing data.
4. Restart Chrome and go to the website you were having issues with to check that this has fixed the problem.