As Citrix employees we all write and contribute to the articles in the knowledgebase. This issue I can across a time ago which I believe can happen when not using the latest versions and patches.
When opening the XenApp 6.5 AppCenter console no policies are visible.
XenApp 6.5 Policies are created with the Citrix Group Policy Management Console v1.7.
When starting the AppCenter console for XenApp 6.5 and viewing the policies section (user and computer) some or all policies are not visible.