Strange track/bus level issue when exporting

Hi,
 
The latest CbB does weird tricks when exporting in a project of mine. It sounds as some tracks or buses are being soloed with the Dim function on; the quiet tracks are really quiet and the louder ones are seemingly at normal level. When played back, all mix levels are as they should be. I first thought this was a bug with MP3 export, but then it happened with WAV export as well. Export is being done from entire mix ("What you hear").
 
The issue seems to go away after having clicked the global Solo button and/or the Dim button.
 
Has anyone else experienced similar problems lately?
 
Cheers,
             Pete