[Therion] Fatal Error in Wish - Tk_GetPixmap

[Wolfgang Zillig]

Hi,
I'm getting sometimes an error in Wish:
"Fail to create pixmap with Tk_GetPixmap in ImgPhotoInstanceSetSize". It 
seems that the background image in the map editor is too big. However 
sometimes it occurs only by changing the zoom level, ie from 200% to 
100%. What is the maximum image size therion can use as background image 
in map editor?
Best regards
Wolfgang