In case someone else encounters the same problem:
There is an incompatibility between the "Linux File System for Windows" software, from Paragon Software GmbH, and our ImageUSB software.
Paragon's app takes over the USB interface and hides the available USB drives from ImageUSB (and hides them from Windows in general I assume).
Uninstalling the Paragon's app fixes the problem.
There is an incompatibility between the "Linux File System for Windows" software, from Paragon Software GmbH, and our ImageUSB software.
Paragon's app takes over the USB interface and hides the available USB drives from ImageUSB (and hides them from Windows in general I assume).
Uninstalling the Paragon's app fixes the problem.