"Page(s) Unresponsive" ??

So just today I started getting a warning when writing a post that is titled “Page(s) Unresponsive”. The options it allows are 2 buttons: “Kill Pages” & “Wait”.
When I move the mouse over to this dialog box, the entire dialog just vanishes before I can even select either option.

The annoying part is that it does this constantly and I seem to only have to be on my site and idle for less than a minute before this dialog pops up. I’m even seeing this now if I simply have my site up in the browser; regardless of whether or not I’m typing a post.

I’m running WordPress 3.5.1, Chrome24.0.1312.57, Mac OSX 10.8.2

The only thing I did in the last couple days prior to seeing this issue is that I updated several plugins. To be honest, I didn’t even pay much attention to which plugins I specifically updated.

How the heck to I troubleshoot this? Is anyone else seeing this issue?