SG1016 worked before lightning? As you said SG1016 doesn't work, what does it mean? Lights are normal but no internet connection? No IP address obtained?

Firmware is up to date? Connecting directly to your modem, do you have the same problem?

TL-SG2452 or T1600G-52TS is recommended.

Your C7 is V2? What's the firmware version of your C7? Upgrade the latest firmware to see what happens. Besides, how many files in total displayed? As I know, there is a limitation indeed...

Any update on this issue? Did you try to contact TP-LINK support team? http://ticket.tp-link.com/index.php?/Tickets/Submit

They are compatible with each other indeed. No worries... Follow the guidance below to pair them. http://www.tp-link.com/en/faq-258.html