Did you try renaming the file
level.dat_old to
level.dat? That worked for me once before (while also resetting several chunks near spawn and destroying half my house), but I'm not sure if it works with the new save structure.
Cutter John wrote:

I do home 1.7 gives Slimes spawn a boost though. I've actually yet to see one on the server. Even if I did though I wouldn't have the heart to kill them though. I think they're kinda neat. Well, except for the really big ones.
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The small ones are kind of cute, you can easily forget that they're trying to kill you but lack the ability to do damage. Still, I need their balls for sticky pistons and if that means killing some cute green things then that's what I'll do.