3
Always remove mainfile.php from the archive, because that causes the main problems.
If you've removed mainfile.php or overwritten it on the server, your site will simply go white, and you won't be able to do anything. You can manually recreate the mainfile.php file though, using mainfile.dist.php should you ever have this problem again (because I think that's the problem :))
I used to use this account, but no longer.