When working in eclipse plugin development one thing you come across often is the plugin runs as expected when debugging from the Plugin Project, but when you install the exported plugin things just don't work. Reasons for this could be anything as simple as not specifying external jar files in the 'Runtime' tab of the plugin.xml file to something as unexpected as a runtime exception. The easiest way to debug such issues is to launch eclipse with the console running.
Command to launch eclipse with console:
eclipse -debug builder.options
Now all plugin log messages and exception messages will be displayed in the console.
For more details on debugging eclipse plugins for the end user please see: