webviewer used to show Windows Filemanager

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Windows 10
FM Pro11 Advanced

We use a webviewer window to access a folder on a local hard drive containing images. The webviewer defaults to the detailed list view. Most of the times it would be more advantageous to view the large thumbnails. In the past we were able to right click in the window and select the best view from the options windows offered. I do not remember when it stopped working, but now when I right click into the webviewer window, I get the error message "Encountered an improper argument". I have to click OK about 10-20 times before the message goes away.

Is there a fix for that, or a work-around or is there a way to change the default view?

 

Thanks