Party Poker software sometimes does not save my notes!

[friend_]

I started noticing than party sometimes (not always) does not save my notes made on other players.
Today I even made an experiment. Wrote a note on a player, closed the notes window, a note mark appeared on a player (as usual), checked the file Notes.txt - no changes, closed party - no changes in Notes.txt, opened party again, found that player - the note mark disappeared, no notes on him.
I experienced this problem on my both computers with different operating systems.
Did anyone experience the same?