This is such a strange and sudden issue. I've used both these clients before, for a lengthy amount of time (on this same machine) and they've worked fine. I switched back to the official MSN for Mac (latest version) from Adium for a short while, I still had it in installed from when I used to use it before I started using Adium. I have been using it fine for the past 2 weeks or so, when suddenly when I went to open the app (msn) it crashed upon signing in, I can't get a screenshot of the error as I'm on a different machine at the moment but it's just the standard 'Send report, don't send' error screen. At this point, I wasn't too bothered, I assumed it would just be solved by a restart, but nope it still carried on doing the same thing. Then I reinstalled the program to see if that would fix it, but no, still crashing on the log in. I then just thought, oh screw this I'll go back to Adium. I started up Adium, signed in and it did the same thing! It crashed just like MSN did, except the error report was obviously different, the one with the flaming Adium bird. I've done nothing whatsoever to any of the apps and I've just been using the Mac like I have done for the past 6 months and it seems so strange for this to be doing it now. The Mac I'm using is a Macbook Core 2 Duo 1.83ghz 512 Ram. If you need any other info, just ask.