@JAkzam I once went through a nightmare when I uninstalled on a site I removed it from. I disabled it and uninstalled it and my site crashed. The fix for me was to go in via FTP and remove advanced-cache.php, db.php, w3tc and w3 total cache config.php. I deleted the entire folders and all was OK.
@awhig I have not updatedW3 yet, I am on version 0.9.3. Will your fix work on that version? I would only need to make the changes in lib/W3/ObjectCacheBridge.php right?