REDIRECT in kernel >= 2.6.15 broken???

[KdF]

Hi all
Is there a problem with REDIRECT in kernels >= 2.6.15?

We are using 2.6.14 on a router and billing stations, and users with exceeded quotas are redirected to local server, but after test upgrade to 2.6.15, 15.1 and 16-rc1 REDIRECT seems not to work :(

Packets get forwarded as usual without any attempt to be redirected.
Netfilter is built as a part of whole kernel, not a module.
DNAT does not work too in this case, but 2.6.14.6 works fine on same ruleset and kernel config.