Shoutbox

Those (new) logs are saved as unicode-textfiles because they contain (at some point) an unicode character. This can well be in your contact's nickname or everywhere else which is saved.

So this has nothing todo with the decryption or Messenger Plus! or even MSN Messenger at all. It is your own text editor/viewer which is causing this. The reason why you see those squares is because your text viewer that you use doesn't support unicode textfiles. That is also the reason why Plus! opens them in notepad as notepad is set as the default viewer of textfiles in Windows. Notepad does support unicode textfiles. So if you want to open log files with your own editor/viewer, make sure that it suppost unicode.

Unicode characters consist of 2 bytes of each character. Normal ANSI characters only has 1 byte for each character.