utops: Well, sorry, but judging by your post, there is an issue that seems to appear regularly, and with a defined condition (subspace being involved, apparently). Testing that on debug may take some time, but since there are no other matching reports that I am aware of, it may be a good idea to investigate this further. Since you are the only one in a position to do so, it would help if you actually did investigate it (just play a few rounds with a debug build; sooner or later, the error is bound to pop up), so that we can fix it. Otherwise you'll just be sitting on a malfunctioning FS install, having no fun at all with it.