Hello Roy,
Sorry to hear that you ran into this issue.
You can check out this article for possible causes of why you're unable to sign in to the Articulate 360 Desktop App.
If you're still unable to sign in after going through the article, please follow these steps to remove all Articulate 360 files and registry keys from your computer, so we can start completely fresh:
1) Close the Articulate 360 desktop app by right-clicking the Articulate icon in your computer's system tray (by the clock) and choosing "Quit."
2) Go to your Control Panel and uninstall all Articulate 360 apps, including the Articulate 360 desktop app, Peek 360, Replay 360, Storyline 360, and Studio 360.
3) Download and extract this zip file on your computer: http://articulate-360-kb.s3.amazonaws.com/360cleanup.zip
4) Right-click the 360cleanup.bat file and choose "Run as administrator." The script should only take a few seconds to remove all the Articulate files and registry keys from your computer.
5) Reboot your computer.
6) Download the latest Articulate 360 desktop app here: https://360.articulate.com/downloads
7) Right-click the articulate-360.exe file and choose "Run as administrator."
8) Launch the Articulate 360 desktop app and click "Install" beside each authoring app you want to install.
9) Reboot your computer and test your Articulate apps.
Let me know if this works for you!
