With the latest version of Adium (version 1.5.1) my login to AIM has consistently failed. I have gone to aim.com and confirmed my login/password there. I have checked the Adium Troubleshooting guide that merely says
"Run keychain repair
If Adium prompts you for your password every time you connect, and checking the “remember my password” box does not work, open the Keychain Access application and run Keychain First Aid or Repair from the Keychain Access menu. If that does not solve the problem, you can also try deleting each Adium entry that you see in the Keychain Access application.
If you run an application “slimmer” that removes code from your applications that does not match your computer's CPU architecture, it can cause the same symptoms as described here. Re-downloading and installing a fresh, un-slimmed Adium should solve that problem."
I have done both of those and re-installed Adium. None of these options have fixed the issue. Has anyone else run into this? Can you provide another option for correcting the problem?