Hi,

if it's working with a simple rule then it should work with a more complex one... perhaps there's a PHP syntax error or stray character in the more complex one? It may be that on the new host the error reporting is different so it's now just silently failing instead of reporting an issue.

So I'd suggest 2 things:

1 - turn error reporting onto maximum in the Joomla global configuration, and see if that reports anything

2 - paste your rule into the forum here for me to have a look at, to see if there's anything obviously wrong with it.

Cheers,
Stephen

:-)