In the YaST Package Manager (Install/Remove Software), the leftmost column of
the Repositories tab is supposed to show a list of all enabled repositories. 
However, it does not display repositories that failed to refresh.

If this behaviour is intentional, then I think this is a bad idea. Sometimes
repositories move or get shut down permanently, and users want to see what
software has been installed from them so that they can find a new repository
(or set of repositories) containing the same packages.  For example, the Java
repository that formerly lived at
<http://download.opensuse.org/repositories/Java:/packages/openSUSE_13.2/>.  Now
there is no way for me to use YaST to see which packages I had install from
that repository.

Please make sure that the leftmost column displays all enabled repositories. 
If a user clicks on a repository that failed to refresh, then it's OK for the
package table to omit uninstalled packages from that repository, but the table
should still show installed packages from that repository.

As a workaround, packages installed from a given repository (even if it failed
to refresh) can be displayed using zypper on the command line:

$ zypper search -i -r <repository_name>