Hi guys,
i have a very big trouble.

When i try to set an image for an item,
i pick up my pic either from 'browse' or 'browse server',
then I go to save and I get a classic message error from my browser firefox 'connection aborted'

can you help me?

A few things to check
on the k2 information tab, is mb_string enabled?
are the filenames and extensions ok? (simple is better)
try keeping the jpg dimentions under 2000 wide before attaching to k2 items