I ask, because I think this may be part of the problems we have seen with showcase:
Below is a dump of the URI's for a project I did which shows the URI changing between versions which seems to happen when I save the version but am not logged into Squeakland.
$ for f in Chaos*.pr ; do echo "$f"; unzip -c "$f" manifest | tr '\r' '\n' | egrep "URI|user"; done
user: mrsteve
user: mrsteve
user: mrsteve
user: unknown
user: unknown
user: unknown
user: unknown
user: unknown
user: unknown
user: unknown
user: unknown
user: unknown
user: mrsteve