(Note: post is duplicated in the NG)
I haven't seen this issue reported, so I hope it's just me being stupid. (Did I really just say that I hoped I was stupid???)
When I attach a tabbed dock to the left or right edge of my screen, it does not automatically shift from a horizontal to vertical orientation. It acquires the "drawer" behavior, but it does so from the short side of a horizontal rectangle instead of from the long side of a vertical rectangle. So what I get is a long, skinny horizontal dock that slides out from the edge with all the tabs bunched up on the opposite short side. To get the tabbed dock to display like the screenshot at the Stardock site: https://www.stardock.com/products/objectdock/PlusShots/Previe3_small.jpg , I have to manually resize all of the dock edges.
It's not a big issue, but it took me more than a couple of hours (I'm not saying how much more...) to figure out the resizing trick. And this was *after* I figured out how to resize a horizontal dock to accommodate tabs with long names!
I'm running Windows XP Pro, SP1 on a dual-head ATI Radeon 9800 Pro with the display set to stretch across two monitors. Disabling one monitor has no effect on the issue. Interestingly (but in a good way), I can attach the tabbed dock to either side of the "seam" between the two monitors. The dock will attach to the left side of the seam (right side of the left monitor) if the "at right" radio button is ed in Dock Settings...>Positioning>Show dock as a drawer.
-Jeff