iggytwo - thank you for your suggestion, it works perfectly for me. I have Canon D1150, Win10pro x64 with all updates. Tried the "new" driver files and MF toolbox files. No help - MF Toolbox was still having problems correctly operating the scanner. It sort of partially worked, but could not run the feeder among other problems. But Ending Task for the WIA and letting it restart on its own really worked!!!
I use a program called Mastercook and when the Nov W10 update came out, the program couldn't print to any printer. They worked with Microsoft and developed a fix for their version 15 only, as Microsoft suggested they would fix the problems they created with the update - but I wouldn't hold your breath. Seems quite a few programs (maybe with older calls and code that didn't keep up with current Windows requirements) were affected.
Anyway, working fine with this fix! Thanks