These last weeks i had a lot of problems with spout. I even bought a new machine and reinstalled everything. The problem was that default installation is 32 bit java, i have 64bit OS. I Also allocated more RAM to minecraft (my machine has 8gb RAM) I suggest you who has the same problems read and do the following: http://www.minecraftforum.net/topic/350344-allocating-more-memory-to-java-windows/