Drag and Drop Issues

Just downloaded Scapple after I used it before and loved it, but switched comps and forgot about it. Oh, the shame!
Anyhow, I know about the drag and drop feature and loved it. According to the features list, it’s still a part of Scapple, however, the program just isn’t letting me drag and drop. Boo!
I’ve uninstalled and reinstalled…but still no dice.
Any ideas?