OTOY Forums

Hello,

I'm having an issue launching Cinema 4D. As shown in the attached screenshot, the application gets stuck on the splash screen at Initializing Plugins 34%.

I'm currently running Cinema 4D 2026.3.4 with the Octane Studio 2026.4 (v1.9.5) plugin.

I also have an older installation of Cinema 4D 2025 with OctaneRender 2025.1, which works perfectly fine.

Additional details:

- The issue started this morning. Everything was working perfectly fine yesterday, and I haven't made any changes to my setup.
- After a short while, the splash screen simply disappears, and Cinema 4D never launches.
- I've tried several different versions of the Octane plugin, but none of them resolved the issue.
- My colleagues are running the exact same versions of Cinema 4D and Octane on their PCs without any problems.
- I've tried reinstalling both Cinema 4D and the Octane plugin, updating my GPU drivers and CUDA, and clearing my Cinema 4D preferences folder. Unfortunately, none of these steps helped.
- I've also checked the License Manager, and my PC appears to have a valid, activated license.

Working:
Maxon Cinema 4D 2025 + OctaneRender 2025.1 works without any issues.

Not working:
Cinema 4D 2026.3.4 + OctaneRender Studio+ 2.0.3 and several other Octane versions crash on startup.


Has anyone experienced something similar or have any suggestions on what else I could try?

Thanks in advance for any help!

Hi,

From 2026.1 there is a new activation system.

And there is an issue with the new activation system and some operating systems.

In this case, it is necessary to reset the OctaneRender license.

To do this,

- Press windows key and R to open the run dialog
- Copy/paste %LOCALAPPDATA%/OctaneRender
- Okay

- delete/backup the two files with lots of number


- then open the same Run dialog and copy/paste %appdata%/octaneRender

- delete the otoy_credentials file from this folder

Then, try again with c4doctane plugin and report back.

ciao,
Beppe

Hi Beppe,

Thanks for getting back to me and for providing all the details!

The issue is now resolved. I deleted the two files with long strings of random letters and numbers, and when I launched Cinema with Octane again, two new files were generated automatically. After that, everything started working normally!

I'm just curious though, how could those files have changed on their own in the first place? I don't remember making any changes to the them.

Thanks again for your help!