Publication alias is set to "example.com", default lang English. Publication has two issues, one in English, another in Russian (through translation option). They both have articles.
The problem is, that accessing example.com/en, shows everything correctly, but accessing example.com/ru show nothing but a blank page. Apache log is just empty.
I've really no idea, but take a look at front.tpl and the other tpl files of the Russian issue.
Maybe there is the first line : {{ config_load file="{{ $gimme->language->english_name }}.conf" }} at the Russian issue. In this case you will get a blank page if the issue language is set to Russian.
I don't know whether this will be right, but I think it's worth to have a look at it.
Peter is probably right - if you're using latest version of New Custodian or Rockstar, in folder _conf you will need to create file Russian.conf - just copy existing English.conf and then translate the strings inside quotes into Russian.
-- Ljuba Rankovic Senior Front End Developer, Sourcefabric ljuba.rankovic@sourcefabric.org