Okay, so I figured out the problem. I was storing session information for user login purposes, and dataTables "bStateSave : true" to keep track of individual user settings for the data tables.
The problem came up when the datatables were writing cookies to the browser. it was overwriting, or changing session values that were being used for security, thus locking up the domain until the session expired (or until I deleted the cookie).
I'm still fairly new to web development, so I apologize if this is a noobish issue. -.-