Well, removing WLM seems a bit drastic. I have had this issue for about 5 months, maybe longer cuz I just may not have been paying attention. It finally wore on my nerves to the point of troubleshooting.
I have Win7 x64 and the latest messenger client.
I simply uninstalled the Windows Live Sign-In Assistant. I don't remember why/where/when I installed it, but it was there. After doing so, my Mesh account, my Live Messenger, and most programs that ask for my Live ID (hotmail,etc) now just seem to work. One exception is my Live homepage, which I must hit the "sign in" button on each initial launch. Not sure if that was what this program was intended to help with, but I must say, I certainly can live without that now that my machine even boots faster (with Live and Mesh on startup). Your mileage may vary, but this made my life much easier.
-Sharkster
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