where does flash builder 4 store what workspace to open. It keeps crashing with the current one before fb4 opens
in the prefs file is a list of the most recent workspaces, if you delete the first one (including the /n)
C:\Program Files (x86)\Adobe\Adobe Flash Builder 4\configuration\.settings\org.eclipse.ui.ide.prefs
also reduce the number by one in RECENT_WORKSPACES_PROTOCOL
that should fix it
You can control which workspace is opened using the data command line argument. The value is the directory location of the workspace.
You might also try to '-clean' argument which sometimes fixes workspace problems.
I think you can also just rename the workspace that is screwed up, so FB can't find it.
Adobe Flex SDK Team