Having previously succesfully installed zenphoto elsewhere, I am now having this same problem and cannot resolve it. I am not very experienced in these things.

I have populated my zp-config.php file with details from my host and have set permissions to 777 throughout.

What should I do?

Check with your host about the mysql credentials and make sure the mysql user has the appropiate rights. Info on the installation page.

Please ignore last post. It worked when I tried again after 5 minutes.