The drag-and-drop re-factor move of files in the project window is not working for me in IntelliJ IDEA 15. If I right-click on a file in the project window, select Refactor -> Move... from the menu and change the package/folder there it works, but not if I try to drag-and-drop the file from one package to another.
What happens is the dialog appears, but everything is disabled on the dialog box and the only way I can close it is by escaping out (even the close button seems disabled).
This particular IDEA installation is pretty barebones, (no fancy plugins) But perhaps there are some plugin interactions at play. I do have a few other intelliJ installations locally however (a community edition with cursive and an older 14 Ultimate).
I've made sure Enable Drag'n'Drop Functionality in editor is checked under editor settings as indicated in the docs.
Am I missing something here or is this a bug? A cursory googling and SO search did not reveal anything.