ok, i'm trying picasa because i had it already installed.
From picasa i can drag&drop to a folder or the desktop.
it is doing it compatible with Windows file structure.
indeed you can drag&drop from picasa to HFS too.
Trillian is doing nothing to support picasa, it just support receiving standard files, like HFS does.
It's the opposite that's not true, you can't drag from hfs to drop elsewhere.
I don't think it's related to any update you made recently.
My guess it's that it never worked and you are confusing with a similar memory. It's just my guessing but...prove me wrong.