Is this a capeverde problem? Or is it a OpenCL/Cycles issue spesific to 16.5.x?
As a newbie on this forum, I can't contribute in this post. I'm not a developer as I mainly use graphic/game/physic engines developed by others,
but I do debug and can contribute with nailing the problems down and finding a workaround.
So this post is mainly a "hello world", and "I am really human".
First of all, welcome to this forum.
Now coming to the referred blender issue. As of now, it seems an issue specific to 16.5.x. The concerned team is working on it. To get more details, please find my latest comments here: Blender cycles 2.77 OpenCL issue