  In this talk, we review the instability due to radiatively induced FI
tadpoles in ${\cal N}=2$ supersymmetric gauge theories on orbifolds in six
dimensions. Even with the localized FI tadpoles, we have the unbroken
supersymmetry at the expense of having the spontaneous localization of bulk
zero mode. We find the non-decoupling of massive modes unlike the 5D case. We
also comment on the local anomaly cancellation.
