[BUG?] Default download location.
User can delete path to the default download location. Once it was deleted "open containing folder" won't work until another path is specified. Files will be saved in AppData\Local\Vivaldi\Application[VIVALDI_VERSION]. I think it still should download in Downloads folder in case path field is empty of the path specified doesn't exist.
I am not convinced that it is a bug, but it's worth submitting a Bug Report in case it is.