The theme author aren't answering anymore. But, i think it started happening when i changed my language pack from english to norwegian, Is that possible?
To answer that question, change the language back to English and see if that will fix it. If it does then it must be a bug in norwegian language files.
I don''t think it is the template of the custom theme as according to the op it started when he switched the language. Otherwise it would have shown much longer. But it doesn''t hurt to double check