Using this code to delete a usc password entry stalls at the dlgQuestion;

  ldtp.launchapp('seahorse')
  ldtp.waittillguiexist('frmPasswordsandKeys')
  ldtp.expandtablecell('frmPasswordsandKeys', 'ttbl0', 0, 1)
  ldtp.waittillguiexist('dlgPasswords:login')
  ldtp.mouseleftclick('dlgPasswords:login', 'btnClose')
  ldtp.waittillguinotexist('dlgPasswords;login')
  if ldtp.doesrowexist('frmPasswordsandKeys', 'ttbl0', 'Ubuntu Software Center Store') == 1:
   ldtp.selectrow('frmPasswordsandKeys', 'ttbl0', 'Ubuntu Software Center Store')
   ldtp.selectmenuitem('frmPasswordsandKeys', 'mnuDelete')
   assert ldtp.waittillguiexist('dlgQuestion') ***
   ldtp.click('dlgQuestion', 'btnCancel')
  elif ldtp.doesrowexist('frmPasswordsandKeys', 'ttbl0', 'Ubuntu Software Center') == 1:
   ldtp.selectrow('frmPasswordsandKeys', 'ttbl0', 'Ubuntu Software Center')
   ldtp.selectmenuitem('frmPasswordsandKeys', 'mnuDelete')
   assert ldtp.waittillguiexist('dlgQuestion')
   ldtp.click('dlgQuestion', 'btnCancel') ***
  ldtp.selectmenuitem('frmPasswordsandKeys', 'mnuQuit')

the lines with *** at the end are the ones not seen. Could be an issue in atspi however accerciser seems to see the dlg window.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: python-ldtp 2.3.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic x86_64
ApportVersion: 2.0.1-0ubuntu1
Architecture: amd64
Date: Wed Apr 11 19:47:00 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120327)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: ldtp
UpgradeStatus: No upgrade log present (probably fresh install)