Spring RTS Engine

Well, I'm using a ATI card with the latest Catalyst drivers and my client is also unable to load the dynamic water.

I've already hosted a few times without having any problems. But since yesterday I get a "map/folder xxx.smd (for example tangerine.smd) not found" message when I launch the game. On the other hand it worked with neurope. Any idea how to fix that or why the hell this error appeared? Thanks.