If /spawn doesn't work, try /warp gwspawn. There have been cases where /spawn has not worked but /warp gwspawn has worked. It might be just /gwspawn. I forgot if it has the /warp in front of it or not, honestly (I was never actually a guest on this world, so I never had to use it). Sorry if neither of these work (because sometimes they haven't, but not often). There was another warp that I know 100% works. Sawine said it once on a different thread, but I haven't been able to find it. I know it was only 4 characters after the "/". I think it was /mtgw or something like that, however I'm not sure. If Sawine comments on this, he'll know what I'm trying to say.