You have to love the fact that you can automatically update your WordPress plugins from within the admin. It turns what used to be a chore (uploading the updated files via FTP) into a nice neat process. Just a few clicks and you’ve got the latest and greatest versions installed. Except that, sometimes, a new version of a plugin may have an undesired effect on your site.
Those effects could be as small as a slight display issue that requires you to adjust some settings or CSS. They can also be so bad as to give you that dreaded "White Screen of Death" when trying to load your site.
Most likely, if you’ve used WordPress plugins for awhile, something similar has happened to you. If not, you’re either a) very lucky; or b) very careful.