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Changes between Version 4 and Version 5 of Ticket #19726, comment 36

-              v4
+              v5
 .  Is anyone actively working to resolve this?  (even if only a mem usage reporting error?)
+.  Can't revert to 6.1.2 from the latest (now it's 6.1.26), due to error:
+    > `VBoxManage: error: Unknown option: --clipboard`
+    Since the older version expects:
+    > `--clipboard-mode`
+    But I don't know how to wipe that `--clipboard` from the env.  Checked a bit, it is not in my Vagrantfile and even after re-provision with that flag gone from Vagrantfile (on new virtualbox), still getting the same issue.