Building the traditional Wither structure using any combination of soul sand and soul soil in survival or creative won't spawn a wither.
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I have found an issue where the wither won't spawn with snow next to the soulsand. I am running java Minecraft on windows 8 latest version of java 64 bit. I am in normal difficulty. I wonder if this was the issue? If so should I create a new report?
No this Works as Intended. Anything next to the creation of a Golem (even snow) won't make the golem.
Are you in Peaceful mode?