• What version of the add-on are you using? 1.11.07
  
• What version of Firefox are you using? 3.0.1 (Mac OS 10.5.4)
  
• What locale is your Firefox set to? (e.g. en-US, pt-BR, etc.) en-US
  
• Are you using regular Gmail or Google Apps? gmail
  
• Do you have any "send as" addresses set up? yes, 1 other
  
• What language is your Gmail account set to? english
  
• What other add-ons do you have installed and enabled? all addons disabled. installed add-ons: adblock plus (0.7.5.5), better gmail 2 (0.6.1), delicious bookmarks (2.0.95), firebug (1.2.0b15), greasemonkey (0.8.20080609.0), web developer (1.1.16), yslow (0.9.5b2).

cleared cache, set options to "reinsert", have a signature created for secondary send-as account ("business), but not for primary/default send-as.

halp!?!