People who don't understand the difference between relative and absolute directory paths.
A company has sent me their component library to complete a contract job but all the references are absolute to a corporate drive that I do not have access to.
This is a problem that will revisit them if they ever need to bring in external CAD services.
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History is much like an endless waltz: The three beats of war, peace and revolution continue on forever.
However history will change with my coronation - Mariemaia Khushrenada