Hi Noseman, here’s an update on my situation.
I’ve run the following tests; you can view them at this link:

https://youtu.be/S1EJ2N-VRzQ

• updated graphics card drivers
• uninstalled C4D R2026
• deleted the preferences folder
• installed R2026 (releases: 2026.3.4, 2026.3.3, and 2026.3.2; one at a time)

but the problem persists across all versions.

• I installed the older version, 2025.3.3, and I have no issues with that one.

It seems strange to me that the problem would be related to my setup.

For now, I’ll use R2025 for modeling.

Thanks.

Hi Noseman, it's a pleasure talking to you (I'm a fan :)). I've uploaded a screenshot of the issue. I recall never having any trouble changing the plane or mode before. Now, the drop-down menu isn't available (at least not for me). What am I doing wrong? Thanks for the help.

https://youtu.be/8kZ7mtu3O3Q

Hi guys, I used to use the mirror tool without any problem. With the latest release I can't change the coordinate system and the mirror plane of the tool active in polygons mode

Any help? thanks

Cinema_4D_Bpnn1R714N.png