Yep, shake it is right - that I will do before I print the next one.
Be sure to post your results after trying the parchment paper - someone on another board posted saying his efforts gave a good looking transfer to the copper, but had problems with etch in large areas like ground planes. Didn't say what type of problems, just "problems".
If the toner is transferring from the paper to copper, I don't see how etching would make any difference. I'm looking forward to hearing how your etch turns out. I may try to etch a sample board today - just to see.
I've never seen a paper do as good a job on toner transfer as does the parchment paper.
Ken H>