As of yesterday, official TT response is that they are aware of the bug. But there is no solution. The recommended work around is to create another account, uninstall, remove all TT related files, and reinstall TT.
i tried it and it did not work for me. I may not have removed every file.
therefore the only solution I know is the one shown above, remove the cache either using Finder or shell prompt. And then call support to pay and get pin for efiling.
