When I was trying to use Ctrl + Q to drop a stack of items in creative mode, it only dropped one item instead of the whole stack. I tried other stacks of items and I had the same problem. So, Ctrl + Q on a Mac won't drop a stack of items anymore in Minecraft 1.8.
Please fixed and thanks for reading.
Try Command+Q. Recently, the method for copy/pasting was changed from Ctrl to Cmd.