You'vefallenvictimto thestupidity ofantivirussoftware (almost all words in this sentence point to different precedents). Try any of the other snapshots or the official builds; you'll soon run into other ones that are flagged. AVs really don't like TPT for some reason; your only option is to add an exception or whatever works with your choice of ~~performance degrader~~ ~~cycle waster~~, *cough*, AV.
It has been discovered that all built-in GOL types are broken in snapshot 201. The custom ones work fine though; I guess everyone should just focus on those for now. Snapshot 202 fixed this.
In the meantime, jacob1 fixed the bug that caused the snapshot server to flag snapshot 201 as invalid.