Error when changing order status

[delia]

When changing the order status, the page shows an o only and throws a error

[13-Jan-2016 08:08:28 America/New_York] PHP Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /home/xxxx/public_html/xxxxx/orders.php:1) in /home/xxxxx/public_html/includes/functions/sessions.php on line 115
[13-Jan-2016 08:08:28 America/New_York] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/xxxxxx/public_html/xxxxx/orders.php:1) in /home/xxxx/public_html/xxxx/includes/init_includes/init_templates.php on line 28
[13-Jan-2016 08:08:28 America/New_York] PHP Warning: Cannot modify header information - headers already sent by (output started at /home/xxxxx/public_html/xxxxx/orders.php:1) in /home/xxxx/public_html/xxxxx/includes/functions/general.php on line 26

I do have changes to orders.php but am using that same file on other sites on the same server with no problem. I don't see hardly anything extra or different except this one has the testimonials manager.

With no other errors happening that we have noticed in admin, where could the problem lie? I really don't know how to trouble shoot this one. I have checked to make sure there is nothing left over from previous incarnations of various things and check file dates for upgrades. I did upgrade this site back in the fall but this was the first time he's tried to change the order status.

The appearance of the o on the page sounds like there is an extra character in a file. But what file could it be?

[kobra]

Check the orders.php file as "orders.php:1" usually means on line one and that usually means a line before, space before or space after that should not be there

[delia]

That's what I thought. But he just emailed and said it was fixed. Dunno.

[mc12345678]

That's what I thought. But he just emailed and said it was fixed. Dunno.

Think goes without saying, but would be good to follow up with the client and see that they didn't cause some other problem. At least if caught now then would minimize other potential future issues/compounding of future issues.

[delia]

shall take what I can get today. Surgery tomorrow.