I can't remember if I copied them from a 4.0 or a 4.1 system originally - but it could well have been a 4.0 system that I had upgraded to 4.1 via a service pack. Copying them from a 4.0 install should be fine.
I have cured the issue a few times by doing this now. Not sure why SAP have reomved them from the install as it's clearly causing issues.
Other things to check are the language settings on the database (eg the SQL instance language) and the database user/login language (in SQL this should be British English)