dhcp dns problem with 3.11 and ovislink 5460v2

hi
after upgrade from 3.10 to 3.11 on my router,
there is a problem with getting a dns addresses from dhcp
got ip icmp requests by ip works good, but by dns nothing,
when i put manually a dns address everythink works ok

windows xp, tplink equipment (gateway with wisp)
works good with dns obtained from dhcp

anyone confirmed that?

added 10:15am
after downgrading to 3.10 everything works normal
another thing problem are on mipsbe platform
observed on 433ah

blah again downgrading…