Opera Presto haven't gotten any update since 2013 and it won't get anymore. It wil get older and older with more and more problems. You should try the new version.
I am sure it has to be something wrong with his install that's causing the problem. Opera 12 still works just fine, except for a really small minuscule number of websites. No need get carried away and switch to new opera if he don't want to. There are plenty threads about issues with new opera too
That issues with the new one can be fixed.