In fact, it IS a bug of Messenger Plus! too, a bit. Messenger Plus! has now its own logs scanner, that should remove all bad characters from XML log of MSN Messenger. It does not function 100% properly, though, neither Scan XML Logs does.
What I do is same as what monster.rat suggested -- turning off MSN Messenger's chat logs, leaving only MsgPlus! chat logs on.
Another possibility, is that the error might be caused by bad characters once saved in XML log. Maybe MsgPlus!
does remove
all the bad characters since XML log scanner is included (Version 3.50), but the error is caused by previously saved bad character. Try delete or replace all your MSN Messenger chat logs (by default C:\Documents and Settings\
%username%\My Documents\My Received Files\{your email address}\History), maybe that will solve the provlem too