Avrdude Verifcation failure when using -q switch

I don't know if this helps:

I noticed that a new release of avrdude, was released just one month after ver. 5.11 called 5.11.1

So maybe there was a bug in 5.11 ?

http://download.savannah.gnu.org/releases/avrdude/

More about ver. 5.11 problems

http://arduino.cc/forum/index.php/topic,152732.0.html