when i quit limewire i lose all my files, wich was´nt downloaded (happens only when i´m ofline and close limewire)
and when i find the file and downlod it again limewire won´t resume is, even if ith´s the same filesize and the same name as the file in my incomplete folder

Get a newer version.

i already have macosx 10.1.4 and limewire 2.3.4

Well, wait for 2.4.0 then.

same problem
limewire freezes - all other apps not -> hard restart - opening limewire -> empty download list
it really sux when you download some stuff for weeks and you loose it

I've noticed that LimeWire has some kind of leak, which could even cause a crash on less stable systems like MacOSX.

LimeWire 2.4.0 at least will fix the issue, that in case of a crash, the downloads.dat is not saved.