Hmm, okay, this seems to be a really rare cross-threading issue. I am surprised no one else has ever run into this specific one. I'll push a new beta version in just a couple of minutes with a fix for that in there; again, apologies. Out of curiosity, is your machine abnormally fast or slow -- unusual in some fashion in terms of CPU, RAM, or hard disk speed? Otherwise I guess it's just weird bad luck, and either way this upcoming fix should do it, but that's pretty odd.