A new version of Cloo is out.
It introduces a tracking mechanism for kernel arguments (sampler or memory objects) which prevents them from being claimed by the GC in case the user application doesn't refer to them in later code. This behaviour has been backported to the existing Set*Argument methods since it is safer. You can override auto-tracking using the newly added overloads.
A critical bug affecting image read operations together with some other minor glitches were fixed.
As for breaking changes rename any ComputeImage.PixelSize to ElementSize and you're good to go.
Clootils have been improved, too. Now, you can take advantage of some bells and whistles which control the program building behavior.