I have somehow disabled the feature that allows you to drag and snap video and audio tracks on the timeline to other tracks or positions of import. It is only one project that has been affected, and all I can think of is that while performing some other keyboard shortcut, I accidentally perfromed a shortcut that diabled this feature.
You mean, "Snap?" Press 'S' on the keyboard, or press the magnet button in the Timeline panel.
Yep, that was it. Thanks!