Cannot start Rational Application Developer - possible workspace corruption

Possible workspace corruption. (E.g. after a RAD crash, due to machine shutdown, etc.)

Resolving the problem

There are several possible workarounds to try to recover from this error:

• The simplest workaround to try is to delete (or rename) the file workbench.xml which is found in your workspace in the
  .metadata\.plugins\org.eclipse.ui.workbench folder.
  
  Deleting workbench.xml forces RAD to resort back to the default perspective.

• If the above action does not resolve the problem, the next workaround to try is to run rationalsdp.exe -clean This action forces RAD to reconfigure all the plugins (see link below for additional information).

• You could try to see if the Eclipse Workspace Re-builder tool might help. (See the link under Related information referencing a technote explaining this tool).

If none of these options succeed in helping you recover from a workspace corruption error, you must start a new workspace.

Source Link - http://www-01.ibm.com/support/docview.wss?uid=swg21242350