My IPR WINDOW can't zoom with the scroll wheel after I updated C4D and arnold (Arnold 4.8.1 and C4D 2025.3.1)

[kcchen01]

My IPR WINDOW can't zoom with the scroll wheel after I updated C4D and arnold (Arnold 4.8.1 and C4D 2025.3.1)

Now I can only zoom by adjusting the zoom value at the top of the IPR window

[peter_horvath]

Thank you for reporting the issue. I can reproduce it in Cinema 4D 2025.3.1. Something must have changed in this update. I'll take a look to see if it can be fixed.

[peter_horvath · Accepted solution]

Maxon has confirmed that the issue is caused by a regression in Cinema 4D 2025.3 and provided a fix which is available now in C4DtoA 4.8.2.2.