Error establishing database connection

What version of PHP are you on right now?

Ok, would you please ask your hosting provider? As you mentioned, that does affect what plugins you’ll be able to use.

Hm, I was hoping contacting them would be quicker/easier.

Try creating a file called info.php in the same place as your WordPress files with this content:

<?php

// Show all information, defaults to INFO_ALL
phpinfo();

?>

Visit that in your browser and you’ll see what version of PHP you have.

http://php.net/manual/en/function.phpinfo.php

There should be one more decimal and at least one more digits after the 3, that will be very important.

The last release of the 5.3 branch was 5.3.29.

What’s the name of the plugin?

Excellent, sounds like you’re on the right path. 🙂