The error log for my site is full of these:
[Tue Jan 15 20:30:32 2013] [error] PHP Warning: Invalid argument supplied for foreach() in .../httpdocs/wp-content/plugins/feedwordpress/magpiefromsimplepie.class.php on line 531
[Tue Jan 15 20:30:32 2013] [error] PHP Warning: preg_match(): Compilation failed: unknown option bit(s) set at offset 0 in .../httpdocs/wp-includes/SimplePie/Misc.php on line 1926
I get a big batch of these errors every few minutes. Is there something wrong with my configuration, or is this a bug in the plugin?