To answer myself and to help someone else in this forum: 
	The problem was the bm2dx.dll PATCHED with "Enable Omnimix" option enabled. 
	Downloading the patched bm2dx.dll with that option DISABLED solved the problem. Don't care about d3d9 warning "W:graphics::d3d9: failed to acquire sub swap chain, hr=0x8876086c". 
	That's present even with the game perfectly running.