Minecraft Forums

So I have Ars Magica 2 installed, and it has been me and a couple friends playing on the server. When nobody was on I switched it to peaceful for literally a minute so I could look at some of the new mobs offered by this mod and then switched it back to hard, well, ever since then the spawn rate for mobs has been pitiful at best. If I travel a thousand blocks at night I MAY see maybe a creeper or a skeleton. But there have been mc nights where I will be traveling and never see a single mob. It wasn't that way before. Any help? It's been like this for a about a week now and I have been searching for answers online but haven't found anything that works and I don't wanna start a new map (Which does solve the spawnrate problem)