I have a 1099-R with a distribution amount & no tax withheld. Turbo Tax won't file with no tax withheld. Should I just delete the 1099-R?

Yes, delete the 1099R, and re-enter it manually.

TurboTax does not require withholding to be entered.  Leave the field blank.

If you still have that experience after re-entering the 1099R, please try clearing cookies on your browser, or try a different browser:  How to delete cookies in my browser?