double clicking below rating starts installing payed app and report error

Hi Pavol, thanks for noticing this and reporting it! A fix is committed and will be available soon in the next development release of software-center in Oneiric.

Meanwhile, please don't double-click in that area below the ratings screen in the for purchases section. ;)

Thanks again!

wow, that was quick

my pleasure, thanks for tip :-D

This bug was fixed in the package software-center - 4.1.7

---------------
software-center (4.1.7) oneiric; urgency=low

  [ Aaron Peachey ]
  * Add fake-review API that can be used for GUI testing and
    automatic testing without actually hitting the network.
    Can be enabled with the SOFTWARE_CENTER_FAKE_REVIEW_API=1
    environment
  * add support to remove/modify reviews, this requires the
    new rnrserver in production

  [ Michael Vogt ]
  * merged lp:~aaronp/software-center/tests, many thanks
  * merged lp:~mvo/software-center/piston-sc-agent:
    This move the SoftwareCenterAgent support from restfulclient
    to piston-mini-client and adds a new SpawnHelper abstraction.
    It also adds a new SOFTWARE_CENTER_AGENT_INCLUDE_QA environment
    to get apps in QA (if you are in the right group)
  * remove get_http_proxy_string_from_gconf and remove python-gconf
    dependency

  [ Gary Lasker ]
  * merge lp:~evfool/software-center/smallfixes to fix up mouse click
    handling for LinkButton, many thanks to Robert Roth (LP: #796640)
  * merge lp:~mterry/software-center/drop-deja-dup courtesy Michael
    Terry, removes deja-dup from the featured apps list since it has
    been promoted to main
  * merge lp:~evfool/software-center/fixnavigation, fixes navigation
    error when searching (LP: #801114)
  * softwarecenter/ui/gtk/appview.py:
    - fix phantom install button in for purchase listview (LP: #801512)
  * softwarecenter/db/update.py:
    - add support for custom desktop key X-Ubuntu-Software-Center-Name
      for USC-specific display names (LP: #801197)
  * softwarecenter/ui/gtk/appdetailsview_gtk.py:
    - don't start the indeterminate progress bar for purchase
      transactions until after the authentication dialog is closed
      (LP: #725181)
  * softwarecenter/utils.py,
    softwarecenter/backend/aptd.py,
    test/test_software_channels.py:
    - obfuscate private ppa details in the error log output and in
      the error dialog itself, add corresponding unit test

  [ Steve Langasek ]
  * debian/control: point Vcs-Bzr field at the right branch.
 -- Michael Vogt <email address hidden> Mon, 04 Jul 2011 07:41:36 +0100