Switched Servers – Now Some Plugins Don’t Work

We recently moved to a different server and now a simple plugin I wrote stopped working. It checks the post for “[flickr]setid[/flickr]” and replaces that text with a flash slideshow. The code does a “preg_match_all” and swaps in the slideshow if it matches, and then does “add_filter(‘the_content’, ‘insertFlickr’);” at the end of the plugin. Is there some reason why this would work on my old server but not the new one?