This one looks familiar. Have you tried using Save a Copy as... with the clone option to get an empty copy of your database and then imported all records from your current file into the clone. I've seen some funky date issues when there were certain system date settings specified for the OS. The key detail that has me thinking in this direction is the spaces instead of / that are appearing. In the case where I saw this before, we were able to fix the issue by importing into a clone.
I'll try that.... I did in the meantime try to install temporarily Filemaker on my other mac and use the same file and discovered the problem doesn't appear here!! So I'm also trying to understand what settings might be different from one computer to the other.
Thanks for your advice. I'll post the outcome as soon as I'll try your solution.
Hi there, I manage to resolve the problem by setting all the date-field as custom instead of dd/mm/yyyy as automatic. Now everything works fine.
Thanks a lot for your support.