Hadn't noticed this before, but Google has a link under Labs now to run Gmail without any labs features enabled. This is great for figuring out if a labs feature is conflicting with BCGS or other add-ons.

From Google: "If (when) a Labs feature breaks, and you're having trouble loading your inbox, there's an escape hatch. Use https://mail.google.com/mail/?labs=0 "

If you're running Google Apps Gmail, the same url variable applies. Simply add ?labs=0 to the end of the Gmail url (or go to settings>labs and click the link).