Without seeing the macro in question, it's impossible for anyone here to comment on why it might be causing problems with your documents (notwithstanding what its creators say). That said, it's also possible the problem is caused by congested Temp folder. See: https://support.microsoft.com/en-us/kb/211632. Exiting Office then clearing any orphaned temporary files from the Temp folder may resolve the issue.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]