Qlik Sense Desktop hangs at "Initializing Add data"

[Sonja_Bauernfeind]

Opening the Add data wizard or dragging/droping a data file into Qlik Sense Desktop, the screen hangs and the following error is displayed:

Initializing Add data 

Resolution

1. Make sure the user running Qlik Sense Desktop has full control to folder C:\Users\<username>\AppData\Local\Programs\Qlik\Sense\DataPrepService
2. Run the matching installation file with admin privilege and repair the installation. You may need to download it from the Qlik download site again: https://demo.qlik.com/download/
3. Internet Explorer limits the number of WebSockets. It may be necessary to increase them: Increase Maximum Number of Websocket per connections allowed for Internet Explorer (Cannot create co...

In some cases it was needed to uninstall and reinstall as below:

1. Uninstall Qlik Sense Desktop from Control Panel / Uninstall programs
2. Delete the program folders located in:
   C:\Users\<username>\AppData\Local\Programs\Qlik\Sense
   C:\Users\<username>\AppData\Local\Programs\Common Files\Qlik\Custom Data
3. Install Qlik Sense Desktop by Signing on as an Administrator and doing a Right Click Run as Administrator
4. Select the Custom Installation option when you get asked and
   - Install Qlik Sense Desktop to a Folder that all users have full rights access
   - Select the same Folder in the Next screen.
5. Let the installation continue as normal