This problem was discovered by a Swedish library that has 'en', 'nb-NO' and 'sv-SE' installed - and 'en' and 'sv-SE' enabled as languages in the OPAC.
Whether a new visitor sees any news items on the main page depends on what her browser language preferences are set to:
* nb-no = The OPAC is displayed in Norwegian (and no news items are displayed). This is described in bug 2562: http://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=2562
* sv = The page is displayed in Swedish, but no news items are displayed. FAIL!
* sv-se = The page is displayed in Swedish, with news items for sv-SE also displayed. Correct.
So, the code that displays news should probably be able to make the connection sv -> sv-se the same way the language related code does.
Magnus, can you tell if this is still an issue?
As far as I can see this is no longer an issue.