What is this setup: sfp-rate-selection=high/low option in "/interface ethernet" menu?

I have a same problem! (This ethernet lockup problem still exist: RB493G, RB600, RB435G)
Janisk look at: http://forum.mikrotik.com/viewtopic.php ... hilit=493g

Thank you!

In case of 3.0RC9 worked fine the following command in terminal:
/ queue simple remove [/ queue simple find interface=all]

but in case of 3.0RC10 i have got this error message:
ambiguous value of interface, more than one possible value matches input

Is it a 3.0RC10 bug too?