What do you see on the screen? Are you able to log in properly? Is the screen just black?
In any case, there are a few things you can try:
- Modify the settings:
Disable all plug-ins and extensions.
Open Alfred in Incognito mode.
Try on a different PC.
Please keep us posted! There are many, many variables when it comes to the WebViewer, which makes troubleshooting more complicated.