This is probably the same topic as mentioned in this post.
I really like the conditional formatting in principle, but it becomes practially useless in my application, where the reference cell must be defined relatively to the cell that shall be formatted. Even if one removes the $ signs in the address of the cell that is referred to, copying the format via the paintbrush will still keep the exact same cell as a reference. As this behaviour is inconsistent with copying cells (where addresses are adjusted if the $ is not there), I would consider this a bug.
I created a demonstration with explanations, which is available here.
Thanks! Martin