Successfully used TaxAct Premier edition and submitted Federal and State returns for 2019; HOWEVER I had to change my password EVERY TIME to log in. (And since the last four passwords are remembered I had to have at least 5 passwords to keep track of.) Customer support, both by chat and telephone (more than once) suggested it had to be a browser problem. They refused to acknowledge that the problem could be with TaxAct; I believe it had to be.
I tried the following: three different browsers (IE 11, Chrome, Firefox), three operating systems (Win 10, Win 7, Ubuntu 16), turned off automatic fill-ins, cleared saved passwords (for TaxAct), incognito browsing, cleared historical data (cookies), cleared cache, removed/reinstalled Chrome and Firefox, everything customer support suggested and more, all to no avail.
I am totally dissatisfied with TaxAct, but would use it next year if the company if they would show any indication that they care about solving the problem. BUT THEY'RE NOT.