Hello,
We've published PS 1.4.8 including a fix for this issue:
Select Options / Extras / Data Source Manager (select 1.9 or System for example).
Hope this helps !
Link for download: http://www.orpalis.com/products/paperscan/
Change history: http://www.orpalis.com/products/paperscan/history/
Hope this helps !
Kind regards,
Loïc