First let me say this is the best monitoring and alert solution I have yet to come across, and I will gladly donate if I can get it working again - which brings me to my question

I just installed phpminer for the first time yesterday (version 1.2.1) I had it all configured and working well until today, when I saw a new version was out. I downloaded the 1.3.1 zip and ran the linux installer script like I did for the initial installation of 1.2.1. During the install it prompted for mysql user and password, which I guessed as phpminer/phpminer. When this finished I tried to open the web page and was greeted with a notice that I had just installed or upgraded phpminer, and I should install mysql and edit config.php with my database connection details. This puzzled me since I already installed mysql when I installed version 1.2.1 yesterday. Rather than reinstall mysql I edited the config.php file in the config folder with what I thought were the correct database connection details. After doing that I can open the main page, but all of my miners are gone, and there's an error "can't connect to driver" at the top left of each page.
So my question is have I completely broken my installation? What's the correct procedure for upgrading? Thanks and keep up the great work - this is a great app!