Invisible players and dropped items

[cubecraft_bot]

sometimes i cant see any players, yourself and dropped items
third person:

Spoiler

installed mods:

Spoiler

have no texture pack


when i turn off the optifine, i have not this problem.

 

[Power Ranger]

I believe this is just a 1.9 thing that causes the players to become invisible as this happens on a vanilla server I play on as well. Though it does seen to happen more often on cubecraft...

 

[ciwa]

Maybe they dropped a potion of ''invisibility''. :P