URL Rewrite doesn't work in v3.0 but works in v2.0

Hi,

just re-installed v3.0 r503 but URL Rewrite still doesn't work.

Jisko v2.0 installed in same hosting space (different folder) works fine...

.htaccess files of both are same

So there's some code in v3.0 which is effecting the working of URL Rewrite in V3.0.
As soon as Clean URLs is activated the website goes in Redirect Loop
No effect on putting SHARED HOST in config.

Any Solution?

Thanks,
Pat