I'm lost in this issue... maybe it's an trivial problem, but i've no clue to solve it.
Btw. i'm new to OpenCL

Code :
kernel void Update(global float* MeasuredProjection, global float* CurrentVolume, global float* numinatorBuffer, global float* denominatorBuffer)
// HERE IS SOME RayResampleStuff
// If a Ray hits a Voxel the VoxelIndex will be stored in an Array called VoxelOffsetList
for (int j= 0; j < HitCount; j++)
 int UpdateOffset = VoxelOffsetList[j];
 numinatorBuffer[UpdateOffset] += d_value; //numinatorBuffer is 	a global float*								        
 denominatorBuffer[UpdateOffset] += 1; //denominatorBuffer is a global float*

Getting some sort of artefacts...

Do i have to synchronize the access to the global buffers?
Is there another way to solve this problem?

Thanks in advance!