Drag folder onto Dock in Mac Finder opens a new window

Normally, when an older Bridge version was running, I could drag a folder to the Mac's Dock icon and let it open in Bridge as a (new) window. Nowadays, it replaces the content of the current window, and if there's no window open, it doesn't even create one (like it used to do). Nor can I use the Command-N key to whip up a new window (which might be considered a bug...)