Dynamic Translations - Sometimes Translated Sometimes not

Question

Apex 3.1
Oracle 10.2.0.2 on aix
I am having a little issue with dynamic translations.
All of the translations work okay in the LOV's, however when I use the values in reports, they sometimes appear translated and sometimes don't appear translated.
I have been using the apex_lang.lang(column_name) function in the queries which I am using for the reports
The only other thing probbaly worth mentioning is that the reports only appear when the page is submitted.
The page still remains in the foreign language (its not switching back to english)
Sometimes if I copy the english text from the report, and do another translation, the report shows up with the correct language (but I now am translating 2 strings exactly the same way)
Any ideas on what's causing this

Answer 1

I've put up a small sample on apex.com. [My application|http://apex.oracle.com/pls/otn/f?p=33452]
Note that the application has been changed to use application express credentials so you need to basically login with your workspace and password.
I've put data in the first two reports, which both work fine.
In the second report (I've left the original query commented out). My second report does not translate the data, although publishing it here indicates everything is correct and it translates so I'm at a loss as to why this is the case
I have applied my translation file and the menus/buttons etc do not appear to have been translated.
I had a quick look at the file and it does appear the translations are there