Hidden change of $UserName
This is more a WARNING than a question
In a default installation I see this behaviour:
until a re-install (not upgrade) to a new version
you might easy understand the confusion this caused as $USERNAME is my preferred item to check, display, ...
with help of WRC it turned out that it was cause of a system wide setting.
System > Security Management > System-wide Security Parameters
Removing the hook returned me to default behaviour
Needless to say that I could't find any docs on this unexpected surprise.
So be warned !