I don’t have an explanation for you not able to connect to an empty free account while I don’t have a problem. I don’t think this is the browser.
You can try to update the DLLs from the file I’m attaching.
Stops and restart Duplicati after having copied the 2 files in c:\program files\duplicati2. These files have been tested with last Duplicati, not beta, so if you have beta and it crashes with the patched files, try to update to canary (in this case you may have to restore the original files, so save them first).
updatemega.zip (59.1 KB)