Problem with PPPoE connection (ADSL) from version 2.8.11

After we upgrade from ver. 2.8.8 to 2.8.11 we have a problem.
We cannot establish the ADSL connection using PPPoE with our provider(estabilish link-disconnect-estabilish link-disconnect...in about every 3-4 sec interval). We try to remove,add and make new PPPoE connection but still not working. After 2 hours of testing we downgrade to V 2.8.8 and PPPoE works again correctly...

PS: We use the Siemens XpressLink modem

If anyone have solution about that problem please write in to forum

Thanks in advnace

Christos Ioannou

maybe this will help a bit: http://forum.mikrotik.com/phpbb2/viewtopic.php?t=701