Since updating to mindcrack 8.1.1 on my server I have been having chunk loading problems. When I first log on it is fine, a few minutes later however no chunks will load. I can walk to edge of the loaded chunks and nothing will appear. If I switch the graphics quality (fancy etc..) it will load up and be fine for a while but the error will happen again pretty soon. Any ideas? I'm not getting server errors and the cpu/ram are both fine.