I have a similar problem where if I attempt any scan, even a single photo, it immediately becomes stuck saying "1% calculating". I have attempted to leave it on this stage with full scans and it has not become unstuck, whereas a one file scan will eventually (after 10-15 minutes) become unstuck and scan successfully.
The method I have found to resolve this is restart my computer and immediately attempt the full scan or if I successfully complete a scan subsequent scans progress with no issue.
Here are the specifications of my computer:
