This worked for me, let me know if it doesn't for you.
1. Open your The Sims 3 folder.
2. Find the base game.
3. Right click base game.
4. Click "Show Package Contents".
5. Open Contents folder.
6. Find info.plist and click on it. (Copy and paste it, that way I'm not responsible for nothing working at all in it- even though I technically am- if there's a mess up)
7. Find words: S3Launcher.exe.
8. Delete S3Launcher (DO NOT DELELTE .EXE)
9. Replace S3Launcher with TS3.
10. Open your game to make sure it works.
It worked for me when I did it. Hopefully EA fixes the problem.
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http://answers.ea.com/t5/The-Sims-Mac/CURRENT-ISSUE-The-Sims-3-Disc-Authorisation-No-Disc-Errors/m-p/4882518#U4882518