P: Canon tethering stopped working after updating to Lightroom Classic v15.4

Hi Adobe community, 

Recently my R5 MrkII has not been able to send a photo to LrC while tethered. I am able to control the camera’s settings and trigger the release through LrC, but it wont save the photo. The photo count flashes as though it's trying to save the image. It successfully saves the image locally on the SD but fails to send it to the computer. This issue started seemingly out of no where; Canon forums think it may be linked to the MAC 26.5.1 update, though Im not entirly sure when the update happened on my computer. I think this counts a bug for your review. 

Troubleshooting so far:

Restarted everything, R5 Firmware updated, checked for computer and LrC updates, tried alt cables (original cables and tethering work on an R6 MkII), disabled all communication settings, reset communication settings, restarting the tether handshake, and resetting Lightroom Classic preferences.

Hardware - Firmware - Software 

Camera: firmware was 1.1.1. when issue presented itself, updated to 1.3.1 as part of troubleshooting. 

Tether cables: Canon C-to-C cable that came with the body to a Tether Tools C-to-C extension cable.

Computer: MacBook M3 Pro - macOS Tahoe 26.5.1 - current version as of time of post. 

LrC: 15.4.1 - current version as of time of post. 

Seems like Adobe’s new “Improved tethering for Canon Cameras” needed a lot more thorough testing by Adobe before releasing it?

I also found that checking “Use Canon SDK for tethering Canon cameras” solves the problem. So the native Adobe tethering doesn’t seem to work properly?

Yes.  I get a “Full” message after shooting 13 frames on my Canon EOS 5DS with Lightroom 15.4.1 tethered. I can fix it temporarily by shooting one frame from the tethered control bar on the screen, but the problem recurs after shooting 13 more frames on the camera. Happens EVERY time after exactly 13 frames. Neither the camera card nor my computer hard drive are anywhere near full.

This version was billed as “Improved tethering for Canon Cameras” ???

I’m having the same problem with the PC FULL error with both my Canon bodies 1DX Mark 1 & Mark 2. Tethering with the Canon utility works fine. I just rolled Lightroom classic to the previous version and everything works again. I’m going to stick with this version for a while.

on canon r6mii after the update i now receive a PC Full error on the camera when shooting tethered. Have never had this happen before

I tried with the SKD protocole and doesn't work. (canon R6M3 user)

I have issues with my new canon r6m3 - after the latest update it doesn't work. I’m already exhausted….

UPDATE: after ticking the box “Use Canon SDK for Tethering” in the general preferences, tethering with Canon Powershot V1 is working again. 

Just tried Canon eos R6 Mark III and it is not working. I will try with Canon SDK…..