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 
Chaos Game II.003.pr
prev-URI: http://squeakland.org/etoys/mrsteve-3456959366
URI: http://squeakland.org/etoys/mrsteve-s1282039561
user: mrsteve
Chaos Game II.004.pr
prev-URI: http://squeakland.org/etoys/mrsteve-3456959366
URI: http://squeakland.org/etoys/mrsteve-s1282039561
user: mrsteve
Chaos Game II.005.pr
prev-URI: http://squeakland.org/etoys/mrsteve-3456959366
URI: http://squeakland.org/etoys/mrsteve-s1282039561
user: mrsteve
Chaos Game II.006.pr
prev-URI: http://squeakland.org/etoys/mrsteve-s1282039561
URI: http://squeakland.org/etoys/unknown-3457719104
user: unknown
Chaos Game II.007.pr
prev-URI: http://squeakland.org/etoys/mrsteve-s1282039561
URI: http://squeakland.org/etoys/unknown-3457719550
user: unknown
Chaos Game II.008.pr
prev-URI: http://squeakland.org/etoys/mrsteve-s1282039561
URI: http://squeakland.org/etoys/unknown-3457721470
user: unknown
Chaos Game II.009.pr
prev-URI: http://squeakland.org/etoys/mrsteve-s1282039561
URI: http://squeakland.org/etoys/unknown-3457724052
user: unknown
Chaos Game II.010.pr
prev-URI: http://squeakland.org/etoys/mrsteve-s1282039561
URI: http://squeakland.org/etoys/unknown-3457725224
user: unknown
Chaos Game II.011.pr
prev-URI: http://squeakland.org/etoys/mrsteve-s1282039561
URI: http://squeakland.org/etoys/unknown-3457727194
user: unknown
Chaos Game II.012.pr
prev-URI: http://squeakland.org/etoys/mrsteve-s1282039561
URI: http://squeakland.org/etoys/unknown-3457727944
user: unknown
Chaos Game II.013.pr
prev-URI: http://squeakland.org/etoys/mrsteve-s1282039561
URI: http://squeakland.org/etoys/unknown-3457729879
user: unknown
Chaos Game II.014.pr
prev-URI: http://squeakland.org/etoys/mrsteve-s1282039561
URI: http://squeakland.org/etoys/unknown-3457729879
user: unknown
Chaos Game II.015.pr
prev-URI: http://squeakland.org/etoys/unknown-3457729879
URI: http://squeakland.org/etoys/mrsteve-3457729879
user: mrsteve