Start the IR, open the node material editor, disable the noise in the middle that’s used as a mask and the yellow appears in the IR.
On more complex scenes whenever I see this yellow I often get a crash soon after but I couldn’t replicate the crash on a simple scene - hopefully sorting the yellow issue will also deal with the crash.
Full-speed non-debug version
Build timestamp: Oct 1 2018 15:15:10
Version: B2 rc 1 (core 3 (DailyBuild Oct 1 2018))
Cinema version: CINEMA 4D Studio R19.068 S
Plugin status: initialized successfully
We have this one (or a related one) on the internal bug tracker - from what I’ve seen so far, it looks like if Noise maps are used in more than one channel / material, then changing anything about the Noise makes the material render yellow until IR is restarted. Changing the Noise did used to cause a crash, but doesn’t seem to any more (for me, in the Beta 2 RC1, the crash seems to have stopped). I’ve added a link to this thread to the internal bug report, so that the info here can be taken into consideration (and hopefully we can reply here when we have a fix for it )