Fantastic! Thanks for your help. No idea why MF Toolbox should stop working after 2 years of no problems, but after wasting about 5 hours reinstalling drivers etc I came accross your post which solved the problem in seconds. Thank you!
I have had this problem - probably too late to help you now! But I think I have solved it. The scanner was saving the document to a location on the hard drive that was synching with Google Drive. This seems to have been causing the problem. I changed...