I don't know if it is a problem with AMOS. I translated some strings in the german language pack de and I tried to get the new strings into my test moodle. I read about the fact that the server generates a new package every hour at xx:45. The last few hours the server did definitly not!
Do you know if the documentation is wrong?
Do you know if there is a problem with the server?
From the moodle docs:
Language pack maintainers have write access into the AMOS strings repository. Therefore they can commit their stage permanently. Once the stage is committed, staged strings are stored in the AMOS repository. Every hour at xx:45, AMOS generates ZIP packages from the most recent snapshot of the repository. These ZIP packages are published at http://download.moodle.org/langpack/2.0/ for download. Moodle sites can install and update language packages automatically from the Site administration > Language > Language packs page.