The biggest issue we see with Lucene Search is file permissions.

In this case you will want to follow these instructions:

  1. Run: chmod –R 0777 [magento root]/var/extendware/ewlucene/ 
  2. Run: php [magento root]/shell/extendware/ewlucene/reindex.php 
  3. Run: chmod –R 0777 [magento root]/var/extendware/ewlucene/