Will fix ethernet. About usb keyboards, I will try to find configs for them. This beta firmware is built from different sources than 20120625 and those new sources seems to be buggy (they closed some bugs, but opened 10 new ones ) . I'm in contact with Amlogic about that...
I now have a copy from the supplier of a VISSON MBX update to 4.0.4 (installed original was 4.0.3) if that is of help. I installed the 4.0.4 and all keyboards work fine again.