Internal Server Error 500 only when saving nodes

Hi,

Have searched in the forums, but can't find anything that helps with this specific problem.

Have just moved to a new server and all is working fine - can see the site, can do all the admin stuff (update works, as does block configuration etc.).

However, when I edit a node and then try to save or preview it I get this error message:

500 Internal Server Error

The request was not completed. The server met an unexpected condition.

    xxx/drupal/node/38/edit?destination=node%2F32 (port 80) 

Apache/2.2.14 (Unix) mod_ssl/2.2.14 OpenSSL/0.9.8e-fips-rhel5 mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 mod_perl/2.0.4 Perl/v5.8.8 Server at xxxx

I've never noticed the "%2F32" before at the end of the address, and when I edit the node and then delete this and then reload the page, I still see the node edit page normally. And it still gives me the 500 error when I try to save it.

Any one any ideas?

Thanks!