I switched my archives over to Dynamic. Since then, the list of Montly Archives stopped displaying properly. For the list of months displayed by the MTArchiveTitle tag, it displays a space and the year, nothing more, making it look like this:

• 2004
  
• 2004
  
• 2004
  
• 2003
  
• etc.

instead of

• Maart 2004
  
• Februari 2004
  
• Januari 2004
  
• December 2003
  
• etc.

I found out this only happens in foreign languages (Dutch in my case). When I set the "Language for Date Display" option to English, everything is fine. With static pages, it works in all languages.

Not all of the languages were converted for dates in dynamic publishing in version 3.1 - these should be available in the upcoming 3.12 release.