[votan]

Neither SCENE_MANAGER nor WINDOW_MANAGER do handle entering/leaving SecureRenderMode properly. (Opening/Closing Crone Market)

SCENE_MANAGER does not wait until all custom fade-scenes reaching SCENE_HIDDEN state.
Any custom fade-scene with a fade-out duration greather than zero will cause security exceptions (Access private function "StopAllMovements" from ...)
One would expect one could dynamically change the fade-out-duration by handling the EVENT_SECURE_RENDER_MODE_CHANGED and call SetHiddenForReason with a zero fade-duration. But this event is not triggered before the market is causing a security exception already. You have no chance to react to this situation.
The only way to overcome this is to create fade-scenes with zero fade-out duration (which is not default value for ZO_FadeSceneFragment!) just for the rare case the market will be opened...

The same thing the other way round: The SCENE_MANAGER does not wait until market scene reaching SCENE_HIDDEN before showing custom scenes again.
Any key-bind function simply doing SCENE_MANAGER:Show("myscene") or SCENE_MANAGER:ShowBaseScene() without checking WINDOW_MNAGER:IsSecureRenderModeEnabled() and skipping any scene change, will cause a security exception.

Please prove I just doing something wrong, but I think the whole SecureRenderMode transition should be reviewed by ZOS.