Gnutella Forums - Invalid directory problem

Even with LW 2.9.6 I keep getting the message that (the folder I was saving to with no problem yesterday) is not a valid directory for saving files and I should pick another. I have playlist pointers and incomplete folders scattered around my disk now. And when my daughters logon and save anywhere ...Latest Java, Win XP Pro updated regularly, Media Player 9. I cannot get the read-only tags on the folders to stay unchecked, so I wonder if it is a Windows vs. users plot. Please believe that I've tried each fix posted and keep having valid directories one day yanked from under my feet the next.
This works so much more smoothly on my Mac with iTunes.