NPrinting designer: Microsoft Excel is waiting for another application to complete an OLE action

When launching NPrinting Designer, an error pops-up: "Microsoft Excel is waiting for another application to complete an OLE action"

Environment:

NPrinting, any

This error concerns Microsoft Excel, and it might be not-NPrinting related.

Here is an example with some tips from Microsoft's Technet.

We suggest investigating the Office installation (if necessary reinstalling/repairing it), and making sure that everything works fine as expected on Microsoft side of things.