Flicker on anything that has reflections - GI Indirect Light enabled is specific to recreate the error
It doesn't matter if Global illumination is enabled or disabled.. if GI Indirect Light is enabled then the iClone renders contain light flicker and is seen at particular camera angles.
When rendering, Specular Tracing is also enabled but again only the GI Indirect Light seems to be the determining factor.
In my renders I don't have anti-aliasing enabled.. I've heard from others that this could be the issue.