WordPress shows that I have 1 plugin update, when all of my plugins are updated. Below is a screenshot so you can see what I'm talking about:

[![](https://i.stack.imgur.com/im5Lp.png)](https://i.stack.imgur.com/im5Lp.png)

Now, I've tried several things, including reinstalling WP, and deleting the transients using [Artiss Transient Cleaner](http://wordpress.org/plugins/artiss-transient-cleaner/), yet nothing seems to work. Any ideas on what could possibly be causing this rogue/ghost "plugin" to be requesting an update when there is none?