Hi an thanks for trying to make Unity better. I think this may be the same problems a bug #1283415 for which a fix is currently being tested in the -proposed pocket of Ubuntu 14.04. Please follow the instructions in comment 4 of that bug and see if it fixes the problem for you.
** Changed in: unity Status: New => Incomplete -- You received this bug notification because you are a member of compiz packagers, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/1373118 Title: Vertical line of pixels separating the launcher from the rest of the screen To manage notifications about this bug go to: https://bugs.launchpad.net/unity/+bug/1373118/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~compiz Post to : compiz@lists.launchpad.net Unsubscribe : https://launchpad.net/~compiz More help : https://help.launchpad.net/ListHelp