Though third-party Twitter clients are working fine, it appears that Twitter.com has gone awry for some users.
The website is not down--there's not a fail whale in sight--but Tweeters have reported that they are unable to tweet or access their Twitter timelines via Twitter.com.
Instead of the typical "What's happening?" box, Twitter.com is displaying only the top black bar displaying the search box and "home," "profile," "messages," and "who to follow" tabs (See screenshot below).
Twitter's official status blog is currently mum on the issue. Are you seeing the odd layout as well? Let us know in the comments below.