Burn folders in Tiger not burning contents correctly


Having upgraded to Tiger and worked out how to use burn folders they seemed a great idea. Dragging files and folders into the burn folder creates an alias, but when burnt this should pick up the real files. This avoids the need for the space on the HD to create a whole disk image.
I have had occasions where the wrong content has been burnt. I have had several folders aliased in the burn folder but ended up with these seperate folders on the CD but duplicate contents in them.
Has anybody else had this problem?
I am now alt-dragging into the blank CD/DVD and not using burn folders at all.