What about this dotted line at the beginning of a task?

[patrickd123]

I noticed that after playing around for a while with my schedule, I'm stuck with a dotted line in front of a task on the Gantt chart. And I just can't get rid of it. You know like when you level a task and in breaks it into pieces and that, at any time after, you can decide to drag them back together? Well, in this case, if I select the block and try to drag it back over the dotted line, the dotted line follows with it so can't get rid of it. Grrrrrrrr!