permalinks not working with 3.7

Permalinks don’t appear to work properly with version 3.7. I had just created a new site a week or two ago, and hadn’t done anything with it. Came back to work on it and was asked to upgrade. Did so. Permalinks don’t save in db.

Note that:

– I have five other WP sites running (not yet upgraded) on the same hosting account. Most have been up for many years now, and none have had any problem with permalinks before;

– I tried several themes, including twenty thirteen, and problem occurs with all;

– I tried deleting the database and starting fresh with new install and new db. Still no luck with permalinks;

– I have not installed any plugins yet, so that is not the problem, either;

– This is a pretty ordinary linux/apache type hosting situation (e.g., no FrontPage or any other confounding stuff like that);

– If I switch back to default permalinks (no SEO), site works okay. Those URLs are saved in all cases.

This looks like it could be a bug and not just a problem unique to my set up, since it’s still more or less virgin. Is anyone else having this problem, and does anyone know of a workaround? I don’t want to update the other sites until I know this won’t happen, since they all have many pages now.

Thank you,
Laurie