This was fixed already.
Wait for the "Tor is ready" notification before starting closing this one and others.
Hide the mouse cursor after closing a notification, and before looking for one.

Else, if the system is fast enough, the next notification immediately moves to
the exact place where the one we just closed was, and the mouse cursor (still
at the same place) hides the cross button somewhat, which prevents Sikuli
from finding it and close the next notification.
fixups! Hide the mouse cursor after closing a notification, and before looking for one.