SDF Model falls completely apart (couldn't find parent link) after todays update (15.04. - gazebo_1.6.2-1~precise_amd64.deb)

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Hi everyone!

Today I installed a Gazebo update package trough the Ubuntu update manager (see extract from the term.log below) and after that my sdf model isn't working anymore.

term.log extract
Preparing to replace gazebo 1.6.1-2~precise (using .../gazebo_1.6.2-1~precise_amd64.deb) ...
Unpacking replacement gazebo ...
Processing triggers for desktop-file-utils ...
Setting up gazebo (1.6.2-1~precise) ...
Processing triggers for libc-bin ...
ldconfig deferred processing now taking place
Log ended: 2013-04-15  12:21:46

When I start Gazebo it says that standard files like empty.world are deprecated.

Warning [parser.cc:361] Converting a deprecated SDF source[/usr/share/gazebo-1.6/worlds/empty.world].
Warning [Converter.cc:61]   Version[1.3] to Version[1.4]
  Please use the gzsdf tool to update your SDF files.
    $ gzsdf convert [sdf_file]
Warning [parser.cc:361] Converting a deprecated SDF source[/home/christoph/.gazebo/models/sun/model.sdf].
Set SDF value
Warning [Converter.cc:61]   Version[1.2] to Version[1.4]
  Please use the gzsdf tool to update your SDF files.
    $ gzsdf convert [sdf_file]
Warning [parser.cc:361] Converting a deprecated SDF source[/home/christoph/.gazebo/models/ground_plane/model.sdf].
Set SDF value
Warning [Converter.cc:61]   Version[1.2] to Version[1.4]
  Please use the gzsdf tool to update your SDF files.
    $ gzsdf convert [sdf_file]

When I load my sdf file the model falls completely apart with the following messages.

Warning [parser.cc:361] Converting a deprecated SDF source[/home/christoph/.gazebo/models/scitos/model.sdf].
Warning [Converter.cc:61]   Version[1.3] to Version[1.4]
  Please use the gzsdf tool to update your SDF files.
    $ gzsdf convert [sdf_file]
Warning [parser.cc:361] Converting a deprecated SDF source[/home/christoph/.gazebo/models/scitos_arm/model.sdf].
Warning [Converter.cc:61]   Version[1.3] to Version[1.4]
  Please use the gzsdf tool to update your SDF files.
    $ gzsdf convert [sdf_file]
Error [SDF.cc:993] Unable to find value for key[link_name]
Error [SDF.cc:993] Unable to find value for key[link_name]
Exception [Joint.cc:125] Couldn't Find Parent Link[]

Error [Model.cc:153] LoadJoint Failed
Error [SDF.cc:993] Unable to find value for key[link_name]
Error [SDF.cc:993] Unable to find value for key[link_name]
Exception [Joint.cc:125] Couldn't Find Parent Link[]

Error [Model.cc:153] LoadJoint Failed
Error [SDF.cc:993] Unable to find value for key[link_name]
Error [SDF.cc:993] Unable to find value for key[link_name]
Exception [Joint.cc:125] Couldn't Find Parent Link[]

Error [Model.cc:153] LoadJoint Failed
Error [SDF.cc:993] Unable to find value for key[link_name]
Error [SDF.cc:993] Unable to find value for key[link_name]
Exception [Joint.cc:125] Couldn't Find Parent Link[]

Since sdf 1.4 isn't live, I don't know why it wants my model in sdf 1.4 format. I then tried the gzsdf convert (with success) but the only thing that got changed were the version number and that ' were replaced by ... (more)