Common SWF problems: Accented characters are
missing in dynamic text fields

Most likely they've been omitted in the "character embed" part of Flash at authoring time. For reference here are the extra characters present in many popular languages that are not present in English. Important: These characters do need to also be present in the font that is being used.

French: œæŒÆâêîôûàèùëïüçéÂÊÎÔÛÀÈÙËÏÜÇÉ

German: ÄäÖöÜüß

Polish: AĄBCĆDEĘFGHIJKLŁMNŃOÓPRSŚTUWYZŹŻaąbcćdeęfghijklłmnńoóprsśtuwyzźż

Russian: АаБбВвГгДдЕеЁёЖжЗзИиЙйКкЛлМмНнОоПпРрСсТтУуФфХхЦцЧчШшЩщЪъЫыЬьЭэЮюЯя

Latvian: ēĒŗŖūŪīĪāĀšŠģĢķĶļĻžŽčČņŅ

Czech, Slovak: AÁBCČDĎEÉĚFGHChIÍJKLMNŇOÓPQRŘSŠTŤUÚŮVWXYÝZŽaábcčdďeéěfghchiíjklmnňoópqrřsštťuúůvwxyýzž

Covering French, German, Spanish, Italian, , Portuguese, Dutch, Swedish, Finnish, Norweigian, Danish : ßåÅàèìòùÀÈÌÒÙáéíóúýÁÉÍÓÚÝâêîôûÂÊÎÔÛäëïöüÿÄËÏÖÜŸÆæØøçÇ¿œŒãñõÃÑÕðÐ