ppalias refers to this as a bug in 2010.
The bug manifests itself as an inability to select a VLAN when attempting to configure a PPPoE interface because only some of the VLANs are shown by the GUI. Selecting the basic interface ie ETHn works correctly.
We have just upgraded to v3.0.0 and the bug is still there.
Does anybody know if there is a fix / workaround to this problem.