
Many tools in Fusion 9 now use OpenCL (Transform, Merge, Masks, Matte Controls, etc)
This can lead to a shortage of GPU memory mainly if you have DaVinci Resolve running concurrently.
In my case I was getting a lot of messages like:
"OpenCL clEnqueueNDRangeKernel failed: CL_MEM_OBJECT_ALLOCATION_FAILURE"
What solved for me was to change the OpenCL cache from "Full" to "Basic".
But it is obvous that this new version of Fusion demands a stronger GPU (or GPUs) with much more memory.