Where can you find the error log of the Web Client?
Errors on the Web client are automatically logged by the system. A file is created for each error and stored under <temp>\Log\Error\<Date>\ on the computer on which Web Client Server is installed. To avoid performance losses, all logging files more than 7 days old are deleted by default. You can change this value if required, in the "DWWeb Client.settings" file, which in a default installation is located in the directory "C:\Inetpub\wwwroot\<Name of Web instance>". Here you can modify the following value to your requirements:
<add key="DWErrorLogOlderThanDays" value="7"/>