Brick wall? - rebuild!?
Sometimes when I hit a brick wall like this I ...
- uninstall all WA extensions
- completely clear DW and WA chache files
- reinstall the extensions, starting with the brick wall
Warning: this can take up several hours.
If up-time is critical to you then this is a case for having a 2nd machine with your full DW environment setup and ready to go, or for having your workstation lean and take regular partition copies to allow quick restore to a fully working condition.
Hope that helps.