SO sorry for all the confusion! I am unaware at this point of a known issue in printing out forms to be included with 1040-X. There have been questions about e-filing amended returns. Since Support told you that it must be mailed, I'd go with that. It's a pain to mail it, but that's the way it's been done forever up until last year, I believe.
Now as to what forms to mail: Worksheets are not typically included in filing. But I'd advise you to go ahead and include in your mailing any forms that TurboTax printed. Be sure you're including all the forms that have changed (of course), and any other forms that the program printed. It's better to have more than enough info than not enough.
Also, remember to SIGN and date your 1040-X, and to mail it using certified mail so you're certain that the IRS has received it. Additionally, if you need to amend a state return, don't forget that.
Again, my apologies. Not an experience that inspires confidence.
*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***
