OK - did that...the application still behaves the same way.
Here is the output after following the directions you listed:
~$ apt-cache policy software-center
software-center:
Installed: 3.0.8
Candidate: 3.0.8
Version table:
*** 3.0.8 0
500 http://archaea.its.sfu.ca/mirror/ubuntu/ maverick-proposed/main
amd64 Packages
100 /var/lib/dpkg/status
3.0.7 0
500 http://archive.ubuntu.com/ubuntu/ maverick-updates/main amd64
Packages
500 http://archaea.its.sfu.ca/mirror/ubuntu/ maverick-updates/main
amd64 Packages
500 http://mirror.csclub.uwaterloo.ca/ubuntu/ maverick-updates/main
amd64 Packages
500 http://ubuntu.linux-bg.org/ubuntu/ maverick-updates/main amd64
Packages
3.0.4 0
500 http://archive.ubuntu.com/ubuntu/ maverick/main amd64 Packages
500 http://archaea.its.sfu.ca/mirror/ubuntu/ maverick/main amd64
Packages
500 http://mirror.csclub.uwaterloo.ca/ubuntu/ maverick/main amd64
Packages
500 http://ubuntu.linux-bg.org/ubuntu/ maverick/main amd64 Packages
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https://bugs.launchpad.net/bugs/731735
Title:
software centre won't quit
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