Last modified: 2010-11-27 15:45:08 UTC
The vertical line between the tabs on the Vector skin is not showing up for Internet Explorer users, any version, at en.wikibooks.org. But this only applies to logged-out users. Log in and the lines appear. Oh, and the logo in the top-left doesn't show up for the site either. Log in and it shows up.
Created attachment 7846 [details] Screenshot of main page in Internet Explorer
We figured out the problem ourselves. An unclosed span tag in MediaWiki:Sitenotice produced the errors that prompted this bug report's creation.