It looks like some changes to the code yesterday may have caused saving to no longer work using the original SMWSQLStore. Specifically, the change to having SMWSemanticData use the class SMWWikiPageValue instead of Title as its subject seems to have not been fully implemented; when you go to save, the function updateData() fails because of the type difference. I can try to diagnose this further if need be, but hopefully one of you knows how to fix this.