Some hosts make it tough to figure out what's going on.
Earlier today a client sent me an email that they were getting a file not found error on their site even though they've uploaded the files to the right place. I've seen GoDaddy show this error before when you try to run a PHP script on a Windows server so that was my first thought, but she has WordPress installed on the same account so it's got to be one of the Linux packages.
Next step was to look at the server headers. It was returning a 403 Forbidden error even though the page said that the file wasn't found. Now, I understand not wanting to output MySQL errors and that sort of thing, but at least give the right type of error.
We'll see how it turns out...
Ryan