Had used TaxAct successfully for several years until my 2016 filing. Submitted my return and was told by the company that the IRS had accepted my return and the amount I owed would be deducted from my bank account.
When the IRS payment did not show up on my bank statement, I eventually reached an IRS operator who told me my return had not been received. She also mentioned that I was not the first TaxAct user to contact her with this same problem and suggested I petition the IRS for an abatement.
From the start of that first call, it took 4 months to finally get my taxes paid and most of my penalties abated. Part of it was my fault for misinterpreting directions and part of it was the IRS whose instructions were out of date for the 2016 filing.
On the bright side, I now have my own personal IRS tale of woe!