I am having difficulty placing vertical bars out of the path of the 4 square chocolate group (assuming you are clearing a path from left to right, over to the larger 9 square group).  I can find placement for the  horizontal bars; I  seem to be left w/ 3 vertical bars, (nearest the 4 square chocolate).   Any hints?
You don't need to clear the entire path before starting to move the chocolate. Clear some room to move the block forward a bit, then start filling the space behind it with the pieces that are in the way next. This should let you move the 2x2 block even further. After this second step you should have enough room in the back to clear the rest of the path to victory. Good luck!
Oh dear, now you will know why I have called myself 'Turtle'  I cannot get past being left with 10 blocks  in the way, and no way of understanding how to move them behind the 2x2 chocolate.
For Turtle and others who may have trouble, I'm including very specific hints for the first few steps. If you're still stuck, I'm also posting a partial solution that covers all of the tricky parts. I recommend that you watch only as much as you need, and try to continue on yourself after every few moves. The CC replay system is nice in that you can jump in at any time.
1. Fill in the lower-left row, except for the leftmost corner square.
2. Fill in the leftmost edge (including the corner square mentioned above) until you can move the chocolate straight down by 3 squares.
3. Fill in the area above the chocolate, and move it down again by 2 squares.
4. You should have a horizontal block that keeps you from proceeding. Clear out space to move it to the top middle row.
5. Move the chocolate up to the top left corner of the middle section (4 squares right of its starting location). Now you should be able to move the rest of the blocks out of the way.
Hello weedhopper, I am still in a muggle!!!  I can get down to the bottom of the left side hallway, but can't find how to go from there.  I can move the horizontal brick up but by doing that and finally getting the chocolate up to the top of the middle hallway, I am unable to then get the other bricks past and out of the way.
I am as yet unable to understand the directions either - as you can guess I am pretty new to this quite apart from being a turtle!
You're almost there, turtle, don't worry! You're doing great so far. Here's some better advice for getting the horizontal brick out of the way.
You should have 4 vertical bricks directly above the horizontal brick you need to move. Place 2 into the gap directly to the right, hugging the middle wall. Bring the other two up and around, so they hug the rightmost wall.
Now you can bring the horizontal brick up into the top right corner of the upper passage, and bring the chocolate into the top left corner. Move every brick you can into the left hall until your path is clear -- don't move the chocolate again until the very end.
If my directions still don't make sense, you can watch the partial solution instead. Select all the text in the gray block and use Edit->Copy in your browser, then switch back to CC. Start 30 Medium and click on "Options", then "Paste Replay", then use "Redo" to step through the movie.
My first time through, I got horribly stuck on this level (and many others). I went back and replayed the Easy levels, and practiced new shortcuts and tricks that I had used on the Medium levels. That way, I got better at learning how CC works, and by the time I worked my way back to the levels I hadn't solved, I found them much easier because I had learned many more techniques.