some sites doesn't load with mikrotik

RouterOS General
1

I hade simple modem connection and it worked ok.
I put Mikrotik rb750g pppoe connection, made some HTB,
and work great except!!: yahoo mail, grooveshark.com, myspace.com…

on these sites i noticed some packat loss (about 20% ping-ing them)
I tried with pcq, and red queuing and it’s all same..
I don’t have some special firewall rules, everything is default

please help

here is my config attached..
izrez.PNG
settings.rsc (20.5 KB)

2

same problem as here http://forum.mikrotik.com/t/problem-with-yahoo-mail/47082/2

3

solved setting mtu and mru at 1492 (8bits are fro pppoe connection)

does exist some script which detect pppoe at 0/0 for {disabling it and enabling than wait one minute} until some data is transpmitted?
I have connection for few days then it reset but no data is transmitting, after disabling/enabling few times it get again to work.