I had this problem today. I called TT support and the rep walked me through the fix:
1. She had me log into my account online and see that the download button is still visible so that I would be able to download it again. (Probably then logged out - can't remember.)
2. close down the TT desktop program
3. uninstall TT
3. turn off my firewall
4. download TT again, then click the .exe file to install
5. navigate to dektop, click icon to open TT
6. Working (Can click on the state tab and it works)
7. Turn firewall back on
