DevoVision is an incredibly useful application to track Filament Extruder data. It is also somewhat of an older application that often has inconveniences. Here's how to avoid one of them.
DevoVision runs on whatever internet browser you are using but it is still an application that resides on your PC / laptop, after you have downloaded and installed it.
To open DevoVision, it's necessary to start it from searchbar. Furthermore you might still need to find the small DevoVision icon in your taskbar and open it from there, too.
This will trigger it to open and be displayed in your browser. If there is no FM connected, you can just refresh the page and use the application by itself to view older logs.
Lastly, if you still cannot load a log file, toggle your workspaces or create a new one.