Illustratr: Use wp_kses_post rather than wp_filter_post_kses. See 5019-wpcom-themes

illustratr/inc/jetpack.php

@@ -95,7 +95,7 @@ function illustratr_portfolio_content( $before = '', $after = '' ) {
 	if ( is_tax() && get_the_archive_description() ) {
 		echo $before . get_the_archive_description() . $after;
 	} else if ( isset( $jetpack_portfolio_content ) && '' != $jetpack_portfolio_content ) {
-		$content = convert_chars( convert_smilies( wptexturize( stripslashes( wp_filter_post_kses( addslashes( $jetpack_portfolio_content ) ) ) ) ) );
+		$content = convert_chars( convert_smilies( wptexturize( wp_kses_post( $jetpack_portfolio_content ) ) ) );
 		echo $before . $content . $after;
 	}
 }