Did you tried to uninstall VLC and then print the pictures from the gallery ?
try disconecting the vlc
turning everything off waiting a minute and then turning them all on again
and re connecting the vlc.
if it prints from the computer directly than the printer should be ok. Its probably something stuck in the vlc from when it did not finish printing the first time. Those devices dont spend a lot of effort on their software. They expect things to work and don't have the fail safe recoveries that a computer has when it does not work right. restarting everything should clear it out so you can start again