takes text from a Fusion VM and pastes it into applications depending on user choice
It may depend on the particular application where the text is copied from.
For example, @jehrler recently discovered an intermittent copy/paste issue that only happens with iWork apps and only when copied via KM.
The problem only arose over time. When I left the client, there was no unusual behavior.
Maybe she has installed some background applications that are interfering somehow? (E.g. a clipboard manager, or even things that at first glance seem completely unrelated.)
Try to boot the client’s Mac in safe mode, launch KM Engine and see if the issue is still there.