Bridge problem, cannot open some web pages

Hi

Created BRIDGE for VPLS, entered VPLS and LAN port to bridge. Now i cannot open certain web pages like speedtest.net or photobucket.com (chrome shows blank page with status: “waiting for website” - and eventually times out). Despite these two pages everything else load up. And if i disable the bridge, these two pages start working again.
I disabled all static filter rules also, still no go.

interfaces:
eth1- wan
eth4 - lan
eth7 - private leased line for vpls
bridge (eth4, vpls)

What is so special about speedtest.net (or photobucket.com) with other pages and how can simple bridge stop them for working?

CCR1072 3.41 / 6.40.4

IMHO bad MTU which makes packets fragmented.