Hi Andrew,
I have gone ahead and made the thread private now to get some more information from you. Would it be possible for you to actually upload of you toggling the various raytracing settings that cause the surface cache to not store any data? I think screenshots make it a bit too difficult to tell what could be going wrong. I have a feeling we might have changed some settings between 5.4.2 and 5.5.4 that might need to be adjusted.