Zu, I always used it with Objectdock and also tiles. I just tried it from my desktop and I can open as many as I want. never tried it from the desktop before. Really don't want desktop icons to show. Has to be something in the dock setting but can't find it.
Ok I found it in objrct dock settings/advanced tweeks and unchecked the top one. Don't see that option with Tiles. Thanks for having me try the desktop icons and when it worked made me look better in object dock