As I thought... I don't think that that "/run/" should be there. The program will only look in /media/username/.This is the sd card as listed by mount:
Code:/dev/sdb1 on /run/media/marek/GATEWAYNAND type vfat (rw,nosuid,nodev,relatime,uid=1000,gid=100,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,showexec,utf8,flush,errors=remount-ro,uhelper=udisks2)
You can fix it quickly by creating a symbolic link:
Code:
sudo ln -s /run/media /media