Uploading files to picasaweb fails

[barna]

When trying to upload pictures from gwenview to picasaweb, I can log in and even create a new album, but uploading the files fails: "Failed to upload photo into Picasaweb: Failed to upload photo. Do you want to continue?"
See also http://ubuntuforums.org/showthread.php?t=1976882

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: kipi-plugins 4:2.5.0-1ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-25.40-generic-pae 3.2.18
Uname: Linux 3.2.0-25-generic-pae i686
ApportVersion: 2.0.1-0ubuntu8
Architecture: i386
Date: Tue Jun 26 09:50:25 2012
InstallationMedia: Kubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
ProcEnviron:
 LANGUAGE=
 TERM=xterm
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: digikam
UpgradeStatus: No upgrade log present (probably fresh install)