Mithical:
I had the same problem and I found a way to fix it.
1. Go to Macintosh HD > /System/Library/Core Services/
2. Scroll down to Dock and copy this to the desktop as a backup
3. Then right click this and "Show Package Contents"
4. Go to /Contents/Resources/
5. Replace the files with these ones https://www.dropbox.com/s/swddyyjtukx2kk3/newfiles.zip
7. Open Terminal and type: killall Dock
original files: https://www.dropbox.com/s/gxjsy5rjzdhjxxb/backup.zip
Doesn't turn all transparent. It leaves behind a grey tint.
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