I run Fedora 20 64bit and with version 12.5 everything was fine.
Then I upgraded (click 13.0 rpm on the download page, give sudo password, done) and double checked in the GUI it uses the 13.0 version.
Ever since I cannot run Diablo2 LoD 1.13c in direct3d any more. In the video test it offers twice directdraw 2d and once 3dfx.
Trying to force Direct3D via registry didn't work, it falls back to directdraw (you can see it, because the colours are more aggresive in directdraw).
I haven't tested to roll back to 12.5 yet.
graphic: AMD 6970M with the open radeon driver