Help with Masquerade please!

I recently changed my network over from an bridged network to an routed network with OSPF.

Everything is workin, except my users that authenticates using PPPOE and Radiusmanager, wont authenticate at all when My masquerade rule is on, that is infront of my ADSL modems.

When I disable the masquerade rule, the users autenticate, but my internet then doesnt work at all.

What can i do to stop this?

Your masquerade rule is wrong. Make sure you only masquerade outgoing traffic to the Internet.