Search doesn't return anything

Hi,

I have made an update to Drupal core two days ago (from 7.39 to 7.40) and, since, the search module doesn't work anymore.

The strange thing is that everything works fine on local, but on line (exact same website), the search doesn't return anything.

I have already run a full re-index of the search and several cron and everything seems ok. No error message, nothing. But the results of the search remain empty.

I just don't know where to find a solution now. Is anyone having the same problem?

Sorry for my poor english and thanks for your help!

Julie