Gliffy Macro Dialog is Missing (Confluence 4 and above)

Some customers have reported seeing this dialog:

Instead of the standard Gliffy Macro Dialog (aka. Start Screen):

We've discovered that when certain system plugins are disabled, Gliffy will exhibit this problem.  This occurs when the 'jira-connector' and 'Jira Macros' plugins have been removed or disabled:

Please make sure that these plugins are installed and enabled.  If they aren't installed, please download the "Jira Macros" plugin here:

https://marketplace.atlassian.com/plugins/confluence.extra.jira

This should bring back the standard Gliffy Macro Dialog