I duplicated a cell and after all my hard work; the lights are broken! I could use help on how to enable lights because I don't remember what cell I duplicated in the first place.

Thanks

I've found that if the lights are not showing up hitting F5 to refresh the cell view will cause them to reactivate temporarily.

That worked, thanks is it a bug or something?

Yep, it seems that the lighting issue, along with the strange HAVOK behavior are bugs in the new GECK that hopefully can be patched.