(WP 2.7.1) Warning: htmlspecialchars_decode() Error when posting source code

Hello,

Since I updated to 2.7.1 I have no longer been able to post any source code without triggering an error; except by disabling the syntax highlighting plugin I use (Syntaxhighlighter). I tried other similar plugins to see if it was a plugin error but not even the 2-day-ago updated Syntaxhighlighter Plus worked.

The error appears when attempting to publish/save/preview any post containing [code] or [sourcecode] tags and this appears:

Warning: htmlspecialchars_decode() expects parameter 1 to be string, NULL given in /home/iniciat/public_html/main/wp-includes/compat.php on line 105

Warning: Cannot modify header information - headers already sent by (output started at /home/iniciat/public_html/main/wp-includes/compat.php:105) in /home/iniciat/public_html/main/wp-includes/pluggable.php on line 850

Any help will be very appreciated,

thanks