We are confronting the same thing. I am also using 2018 Premier.
So I immediately downloaded my state CA software. The process seemed successful because the CA Refund box now has a number populated in it telling me a refund number as well as my "FORM 540" being populated with all kinds of numbers.
I return back to the FED Carryover screen and Viola... the field is still not populated. I save, exit TT, and re-start TT---> still the same. I wonder why it worked for you and not me ?
Anyway I jumped to the CA FORM Schedule D and I see line 6 says"Loss carryover from 2017" = $3605
And the funny thing is when I look at my hard copy printout from 2017 last year the text there says "Loss carryover from 2016" = $3605. LoL Yes, same exact number for 2016/2017. I am not sure what is rotten.
To avoid this TT quirk, for the screen "Do you know your capital loss carryover amounts?" I instead selected YES. This gave adequate instructions of what lines to pull your numbers from related to your 2017 return and the numbers make sense to me.
