Error after upgrading to RubyDevTools 0.6.0

[jfry]

Hi,

I'm getting the following errors:

Trying to create a new rb project:
Plug-in org.rubypeople.rdt.ui was unable to load class
org.rubypeople.rdt.internal.ui.wizards.NewProjectCreationWizard.

Trying to open a rb file:
Plug-in org.rubypeople.rdt.ui was unable to load class
org.rubypeople.rdt.internal.ui.rubyeditor.RubyEditor.

Things I've tried thus far:
* had been using Eclipse 3.0.1 & RDT 0.5.0 - no problems
* upgraded to RDT 0.6.0 & restarted Eclipse - got the error above
* upgraded to Eclipse 3.0.2 & restarted - no change
* rebooted machine (OS = WinXP) - no change

Any suggestions would be appreciated!

Thanks,
Jeff