I am having a problem with some of my conversations as follows. It seems that some of my contacts were typing using a white font, but I am sure there are not, the problem is that I can't read what they are typing unless I copy and paste the message anywhere else. But this only happends with some conversations, not all. If you have any kind of solution I will apreciate it, thanks.

You can override their format with yours with Messenger Plus!

In the main MSN Messenger window go to the menu Plus! > Preferences... > Instant Messages > check the box "Override text format by default"