Problems when updated to 2.1.1

Hello.

I have updated to the latest problem but have now encountered these problems:

1. Cannot log into blog

Warning: Cannot modify header information – headers already sent by (output started at /hsphere/local/home/blunted/bluntedpresents.co.uk/blog/wp-content/themes/nosebleed/functions.php:6) in /hsphere/local/home/blunted/bluntedpresents.co.uk/blog/wp-includes/pluggable.php on line 313

2. RRS feed no longer seems to work

https://feeds.feedburner.com/bluntedpresents
https://bluntedpresents.co.uk/blog/?feed=rss2&author=55

Can anyone help!

Many thanks,

Ssor