This seems to have fixed the problem: https://community.usa.canon.com/t5/Printer-Multifunction-Support/IJ-Scan-Utility-2-3-4-for-Mac-OS-Catalina/m-p/286318#M34148
Same problem on MG7160. Scans first page ok, but fails on the second page with the "failed to open session" message. I am on Catalina 15.3, running on an i7 iMac. The printer is connected the iMac via USB. No issues prior to Catalina upgrade. Did ...
