Comment 14 for bug 494237

$ apt-cache policy kupfer
kupfer:
  Installed: 0+c19.1-0kupferhope1~karmic1
  Candidate: 0+c19.1-0kupferhope1~karmic1
  Version table:
 *** 0+c19.1-0kupferhope1~karmic1 0
        500 http://ppa.launchpad.net karmic/main Packages
        100 /var/lib/dpkg/status
     0+c10-1ubuntu1 0
        500 http://gpl.savoirfairelinux.net karmic/universe Packages
vadi@vadi-laptop:~/Downloads$

I got the blank window again after resuming from suspend. To note, this was probably the main reason for me behind the other blank Kupfers - it was blank after resuming.