Ros 5.6 + WDS + PPPoE bug?

Hello,

Strange behavior on brand newly installed rb800. On one wireless interface I have WDS. On that WDS interface PPPoE server is active. When someone connects to that pppoe, problem start: Anything i try to change on wireless interface (frequency, comment,…) results in complete router misbehavior. I can’t list any of the interfaces (list empty). Reboot helps, but it takes 5min for router to reboot. Any idea?

Anyone have any idea about this problem?