@FitzTheBastard_ If you are using the desktop version, set the view to EASYSTEP and go to page "Save a copy of your return for your records". Click on the option for Federal tax return, and try to save the PDF. If you get no error, then repeat for the Quebec tax return, where you will likely get a pop-up message stating that a form is locked. Now choose the option for individual forms. You will be offered a list of over 30 forms. Check off a dozen forms and see if the error is in that group. If not, move on to the next dozen while unchecking the first dozen. Deselect and select forms until you come to the single form that fails. There may be more than one form that fails. Set your view to "Forms method". Click on the tab at the bottom of the page called "Forms" and then click on the item in the pop-up menu that corresponds to the form that failed in the previous test. You will now see the contents of the form that is failing to print and you can see which fields on this form contain data related indirectly to your slips (T4, RL3, etc.). If your situation is like mine, you entered a T5/RL3 slip because of bank interest which locked the form called TP-726.6. There has been a workaround posted by the moderator of the French forum that forces the software to exclude the bad form from your declaration so that you can Netfile. I prefer to wait for the update from TurboTax promised for March 6, rather than tinker with my return, as I want my TP-726.6 transmitted as is, just in case in the future I need to declare a capital loss and I would want to get the maximum of tax relief that I might be entitled to based on my 25 year history of filing T5/RL3 slips. I realize that bank interest has never been treated as a capital gain in the past, but someday it might be, as the rules concerning capital gains and losses do change at times.
