No permission to upload or create files after upgrade to 9.1

Hi, guys!

After I upgrade owncloud server in my server to v-9.1, I just get an annoying message "You don't have permission to upload or create files here". I've triple checked ownership and permissions in every directory, and they are all OK: every directory/file on the tree is owned by www-data:www-data with permissions rwx.rwx.---.

I'm running Debian Linux 7.11, PHP 5.4.45, Apache2, MySQL 5.5.

Can anybody shed some light on this issue?

Maybe this existing thread gives you some hints:

Well, that doesn't help. Actually, it has nothing to do with the issue I was experiencing. So I decided to give v-10 a try and it simply saved my day! Now it works pretty fine!

Anyway, thank you very much for the attention.

Best regards,