Sorting data by BLOB or other binary fields shows raw data in the header. 

https://sourceforge.net/tracker/?func=detail&aid=3174962&group_id=23067&atid=377408

I tried patching it. Its here

https://sourceforge.net/tracker/?func=detail&aid=3182690&group_id=23067&atid=377410

Cheers,
Ravindra Nath Kakarla