Warning: preg_match_all error after moving to new VPS

Gettign the below errors when users are logged onto the site, but for non users it appears to be fine.

We moved from a webhost that managed PHP and all to our own VPS so im sure its a config of sorts that needs to be set.

I found an old post with the same error but the responses didnt really offer much other then it was fixed and a PHP mod.

http://www.workingdogz.com.au is the site

Warning: preg_match_all() [function.preg-match-all]: Compilation failed: unknown option bit(s) set at offset -1 in /home/flintham/public_html/workingdogz.com.au/wp-includes/compat.php on line 30

Warning: array_slice() expects parameter 1 to be array, null given in /home/flintham/public_html/workingdogz.com.au/wp-includes/compat.php on line 31

Warning: implode() [function.implode]: Invalid arguments passed in /home/flintham/public_html/workingdogz.com.au/wp-includes/compat.php on line 32