Progress bar fast-cgi message from cron

What is "single.phi"? This error probably shows up every time you visit admin/reports/status, rather than being specific to Cron.

FileField attempts to figure out if your server is running PHP as FastCGI by checking the $_SERVER['SERVER_SOFTWARE'] global. However it's not 100% accurate. What's the value of SERVER_SOFTWARE for you? You can check by visiting admin/reports/status/php.

Here's the line that determines if you're running FastCGI or not:

    $fastcgi = strpos($_SERVER['SERVER_SOFTWARE'], 'mod_fastcgi') !== FALSE || strpos($_SERVER["SERVER_SOFTWARE"], 'mod_fcgi') !== FALSE;

So according to your server string, FastCGI is running as indicated by the mod_fcgid part. However, this doesn't necessarily mean that FastCGI is being used for PHP (it's just very likely). Like I said FileField does its best to guess if you're running PHP as mod_php (a native Apache extension) or as FastCGI. Given your server string, I think it made a likely guess. I certainly would expect PHP to be running as FastCGI given that same information. I'm not sure that there's much to be done, a false warning is better than saying that upload progress should work fine when it doesn't.