Using the Vertex theme, same problem. Downgraded from 0.98.2-0ubuntu2.1 to gtk2-engines-murrine=0.98.2-0ubuntu2 which fixed the out-of-place shadow for me.
Using the Vertex theme, same problem. Downgraded from 0.98.2-0ubuntu2.1 to gtk2-engines- murrine= 0.98.2- 0ubuntu2 which fixed the out-of-place shadow for me.