Well, I don't know of any way to duplicate the problem. But I was playing on a server in 1.5 just a few minutes ago, and after the end of one level I got a message saying that DirectX 8 could not be initialized, then an access violation, then it closed Soldat. I had been playing for a little while, so it wasn't the first map switch. And I've never had this problem on any other server.
I was actually playing on the !Elite Snipe & Splice server, which was very recently switched to 1.5. At first it was telling me (on 2 maps) that I had a wrong map version and would kick me from the server. I would re-join, it would do the same thing, but after a few tries it would finally download the correct version.
But I don't know what the deal was with the DX8 graphics. Has anyone else experienced this?