It seems as though PropHunt is abandoned and BlockHunt hasn't been updated for some time. I am using an unofficial build for Spigot 1.8 by addstar, http://jenkins.addstar.com.au/job/BlockHunt/. It fixed issues with lag, but one of the issues I've encountered with official builds for 1.7.2, using the 1.7.2 build on 1.8, and the unofficial build for 1.8, is that the seekers only stay in the seeker's warp for a split second, when they should stay for about 20 seconds so that the hiders can hide. Could this be caused by error on my part, or is it a known bug with BlockHunt? If it is a bug, I do not want to spend time changing the code, so are there any alternatives or unofficial builds that will work on 1.8?