Right, well it seems like no one can see my 3D object in multilayer even though it is activated and I myself can see it.
Also, 3D objects of which I know are owned and activated by a person are (except for, as stated before, my own item) invisible to me when I play with them online.
However this is different in single player, I see my own object and objects of others using the /lp 0/1 command.
Help would be appreciated.

what version in toribash are you using?

they are visible in 4.7 and upper

4.7. They are visible in single player, and I see my own item online but not the items of others, while they say that mine is invisible.
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Pretty sure the people who sead so have a tb version of 4.7 or 4.8.

i had the same problem but i didnt noticed it much, because I switched to 4.8 beta

try the 4.8 beta