Originally Posted by sfpayam
Sometimes, however, the tasks in my plan change color to a dim shade of blue. I'm not sure what causes this but when they do this when I roll over the task I don't get any visual feedback and can't grab the end to connect it to another task. How do I revert this state change for my task?
You've probably switched from Actual to Baseline view. The baseline is intentionally hard to edit since you set that up as the initial plan and shouldn't (usually) change it over the course of the project. You need to switch back to actual view. It's a drop-down menu in the toolbar or an option in the View menu.
(To edit the baseline for a task, use the task inspector or adjust the actual and then set the baseline with the "Baseline" toolbar button.) Hope that helps.