I just installed Eclipse and Force.com IDE on Ubuntu Hardy to do some Salesforce.com development. But I can't get it to create any new Force.com project. It always gives me this error message: "Selected wizard could not be started. Reason: Plug-in com.salesforce.ide.ui was unable to load class com.salesforce.ide.ui.wizards.project.ProjectCreateWizard."
I tried both Eclipse 3.2.2 which comes through Hardy's repository and 3.3.2 I downloaded from Eclipse sourceforge page. Same message. I followed all the instructions for Force.com IDE installation. The only thing that's a little out of normal was Eclipse claimed the plugin packages are unsigned, but I did continue it at the prompt.
Where should I start troubleshooting