I’d say this is a support issue (as this is obviously not desired behaviour), except that you already contacted support. DxO seems to have some issues with their email support team – I’ve had mocking replies from the support team as well. Telling people there are no refunds when they advertise 30 day money back guarantee is a very shortsighted policy.
As is the insanity of not allowing users who have no use for Nik plugins from disabling its buttons and contextual menu with PhotoLab. DxO we bought your software as we were sick of Adobe’s anti-customer policies.