Hi there!
I updated today to the latest C4d (2025.2.0)
And I started having problems with a file I was working on.
I tried to downgrade redshift first, as the error appeared when rendering in redshift but it didn't solve it, the problem was caused by the C4d update, I then downgraded to 2025.1.3 and now it works.
The error is this one:

And I recreated the error in the file attached here:
problem hair.c4d
The issue is simple: you make a polygon selection over an object surface, then create hair there, and try to render: and error appears.
Please try to see if I'm not the only one, I'm now working under 2025.1.3, but I want to upgrade to the latests version as soon as possible.
Thank you!