Trouble with MSN

Have a very strange problem with my Mac MSN.
Two weeks ago when opened my MSN at Mac, all my contacts appeared to be offline and not accepted. Even more, I appeared offline for all of them, but aparently online for me.
Since then, every day I open my MSN Mac is the same thing: a pop up windows shows for every single contact, and I have to accept them all again and again.
Even strange: It occurs to me in two different Macs (my office and at home), each one completely separate, but the MSN Mac have the same problem.
Strangest thing: have no problem with my account on PC, there it works perfect.
I uninstalled both MSN and downloaded new version. Same thing.
I changed my MSN account password. Same thing.
I consulted my local dealer and some friends, and no one can find a solution.
Suggestions?