from Amazon, or check out the Glitches in Spaces | March 18, 2008
I received an email from someone who purchased (or in some other way acquired) my book who seemed distressed that spaces was not working correctly. Specifically, she had Mail set in the Spaces preferences (in the System Preferences) to open in Space #2, and it didn’t! After some back and forth emailing, we found that removing Mail from the “Application Assignments” section of the Preference and re-adding it seemed to fix the problem. Not sure what bugged this up in the first place (though I could offer guesses), however if you find yourself in a similar situation you may try this to see if it fixes your problem.