djncanon wrote:I've tried all the suggested fixes; they all work FOR A WHILE, but then I get the error message 'cannot communicate with scanner...'
I had this problem about 3-4 months ago related to Canon Toolbox 4.9. I'd update, then it would work, then I'd get the "cannot communicate" message. I am not sure what actually fixed it because I tried many things.
Here is what I remember that might help. I found the 4150 firmware update and followed those instructions first. Then I found the updates for the 4150 but I recall that the update used a different model number. By that point, I gave it a try. I still got the "cannot communicate" message so I uninstalled the MF Toolbox and reinstalled it. That seemed to fix it.
I just tried it and I get the MF Toolbox - Scan Function box, and when I click on the PDF scan the second PDF box pops up.
So it still works. Good luck.