I had the same problem with boxes 21. 52 and 53 preventing net filing and tried all the suggestions on here and a few more of my own. I solved my problem by going to the forms section of TurboTax, selecting the T-slips tab and going to T-3 slips. Boxes 52 and 53 contained no entry despite the info having been inputted in Easy Step. I put the required numbers into the spaces manually and the problem was solved and I was able to netfile my return. Obvious the problem is a software problem which Turbo Tax should have fixed weeks ago.
