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R40 scanner now an expensive paperweight


Have an R40 which has been working well on windows 10, latest updates etc. suddenly stops working. Using canon software, and viewscan. Neither recognizes the scanner, get the usual “be sure usb is plugged in and scanner turned on” garbage. Uninstalled/reinstalled canon sw & driver x 2, no change, not recognized. USB recognizes it when turned on, shows up in imaging category in device manager, disable/enable driver, no change.

since I also have a Mac Studio running Ventura w all updates. Decided to try installing on Mac, download & install .dmg driver/sw x 2. OS tells me the software is corrupted. Also tried the Mac TWAIN driver, no joy.

So my R40 scanner now an expensive paperweight. 

thanks canon for your excellent support and crapware. Last canon product I’ll ever buy



I'm hearing a great deal of frustration.  

Your windows OS updated or changed, scanner stopped working

Hamrick VueScan not working

You are unable to run the MAC installer or twain driver due to software corruption.

All Canon's fault?  

If you are here looking for assistance, let us know.

Bay Area - CA

~R5 C ( ~RF Trinity, ~RF 100 Macro, ~RF 100~400, ~RF 100~500, +RF 1.4x TC, +Canon Control Ring, BG-R10

~DxO PhotoLab Elite ~DaVinci Resolve ~Windows11 Pro ~ImageClass MF644Cdw ~Pixel6 ~CarePaks Are Worth It

Frustrated? Yup.
Let’s see: download Mac drivers from cannons website, OS reports software, corrupted. This problem previously brought up in this forum. Blame canon? You betcha. Well, I do not envy software developers, keeping up with every operating system tweak, nevertheless when the function of your hardware depends on it, seems like it should be a rather high priority issue.

Windows 10 issue after recent Microsoft update? Same issue:  seems like verifying the integrity of the drivers after each Windows update, should be pretty significant priority. Particularly when it means your hardware fails and prevents an expensive piece of equipment from being used. Maybe I should blame sunspots?

And, for what it’s worth, I’ve done software development for over 20 years, and have managed large Windows networks, although I’m not a Microsoft certified technician. But I’m  pretty comfortable getting under the hood with windows.

so, yeah – I’m afraid I have to point the finger at Cannon support










Product Expert
Product Expert


If you have not done so, we will have to recommend that you call our Enterprise & Desktop Solutions Divisions at 1-800-423-2366, Monday - Friday, 9:00 AM - 8:00 PM EST (excluding holidays).

We look forward to hearing from you. 

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