Great to hear that. Next, try this, make your vertical icons size smaller, give it some vertical space on top and bottom. After that is done, try moving it again, does it work? If it does not try adjusting the zoom amount lower. Try it again. Does it work now?
If it work, it shows that you have too many icons to display when you hover over the icon to move it causing there is not enough space for the dock to work properly. What you can do is, cut down on the icons or try using the tabbed dock so you can manage your icons better.
Thank you,
Basj,
Stardock Community Assistant