how to reproduce:

• download and start jenkins

  $ cd /tmp
  $ curl -L -o jenkins-1.638.war http://mirrors.jenkins-ci.org/war/1.638/jenkins.war
  $ mkdir jenkins-1.638
  $ export JENKINS_HOME=/tmp/jenkins-1.638
  $ java -Dhudson.DNSMultiCast.disabled=true -jar jenkins-1.638.war
  

• install Jenkins plugins
  • Credentials Plugin
  • Xcode Plugin
• open Manage Jenkins -> Manage Credentials
• add a Apple Developer Profile
• save
• open Manage Jenkins -> Manage Credentials again
• the profile and certificates are shown correctly
• save
• open Manage Jenkins -> Manage Credentials again
• now an error message is shown:
  There's no certificate in this profile

When saving the form the size of the profile on disk changes from 48k to 16b.

All Jenkins using this developer profile fail with this error message:

FATAL: remote file operation failed: /Users/jenkins/developer-profiles/75c9e18b-e0f3-4d42-bcea-6e110f4995dd at hudson.remoting.Channel@48e89e1c:Build Mac Pro HH: java.util.zip.ZipException: archive is not a ZIP archive