I've got a layout with Web Viewer in it. The Web Viewer content is "data:text/html,[Static HTML integrated with Data from FMP]"
I can enter Layout mode, make changes and save, but when I try to return to Browse mode, the application crashes. Using FMP Advanced, version 12.0v5.
I've encountered this problem on numerous databases, both local and hosted, a variety of different Web Viewers with calculated values from simple to complex, and always this problem. The workaround has been to edit the layout, save it, and switch to a different layout, one without a Web Viewer on it. Then return to browse mode, and circle back to the original layout from browse mode.