imac 2011 O/S Mavericks 10.9.5 Have just purchased a mini display port to VGA adaptor to link a second monitor. Cursor is showing up when I drag it across from imac to 2nd monitor but no document nor window can be dragged across. I've tried re-sizing the document as 2nd monitor is smaller than imac monitor, but no luck. Tool-bar shows up on both monitors and cursor shows up, but cannot drag anything across. Have tried re-booting, still no joy. The mirror setting in "Displays" works on both monitors, just unable to drag a document across. Any suggestions?