[Plugin: W3 Total Cache] Error at define.php

I think your plug-in is excellent, however, I am experiencing the following php error:

[31-May-2012 21:56:54] PHP Warning: preg_replace() [function.preg-replace]: Unknown modifier ‘b’ in /home2/…/wp-content/plugins/w3-total-cache/inc/define.php on line 959

Do you have any suggestions as to how to fix this?

Thank you in advance for any assistance.

— Tara

http://ww.wp.xz.cn/extend/plugins/w3-total-cache/