Wrong calculated membership end date with import from csv-file

Hi,

I have upgraded to 4.1.3

After importing 440 actual memberships via csv-file, I could'nt find them in CiviCRM.

After searching a while I found that they were there, but with an "expired" membershipstatus: the end date was not correct calculated. For the most of them years before 2012....

I try several "uploads" with the csv-file and found that the error happens when the field "member since" is imported. When I do no import this field, the end date of actual membership is well calculated and the actual memberships appears as expected.

Is there a way to "re-calculate" the end-date of the imported memberships ? "Clear cache" and "Cron" don't do much here, I found.

Kind regards,

Konrad Maquestieau