When loading the DataSplice instance URL, the browser never reaches the log-in page.
It may encounter 'JSON Parse error: Unexpected identifier "undefined"' or it may hang forever on a blue loading bar.
Cause and Solution
When a browser is in Incognito or Private browsing mode, it is unable to store the files DataSplice needs for the web-application to function.
The solution is to disable, or not use, Incognito or Private browsing mode.