I've had a reply from support confirming that it is indeed a bug. They have told me it is due to be fixed in the next release of firmware.

Thanks - I've submitted a query via support as suggested. If I get anything useful back I'll update here :)

Model : Hardware Version : Not Clear Firmware Version : ISP : Hi Guys Having a strange problem when trying to use VLANs with my access point. In short, it keeps crashing when I turn on VLANs. Let me...