I'm running Suffusion Theme (latest release 4.2.5) in WP 3.4.1 and tried installing Code Snippets - sounds ideal for what I'm doing!
First result after activating my first snippet: Warning: Cannot modify header information - headers already sent by (output started at [redacted] domains/gardenlass.com/html/wp/wp-content/plugins/code-snippets/code-snippets.php(380) : eval()'d code:31) in [redacted]/domains/gardenlass.com/html/wp/wp-includes/pluggable.php on line 881
The snippet was not yet included in a post and already it showed in the header space of both site and admin area.
When I tried to change preferences on another plugin, WP Jump, the blog became inaccessible. I was able to back up to the previous screen and uninstall the plugin, regaining control of my blog.
This plugin says it'll do exactly what I need, which is to embed php code inside posts and pages. The concept of managing snippets like posts is brilliant. Now if it'll just work..?