I had a closer look at the FuzeRock+ and found that some of the code that was previously accepted by the Theme checking software is now rejected.
I do not know the reason for this, since the theme worked for 3.6 with the new syntax and many people were using it. It also worked fine in the simulator.
I spent a little time tracking down the code that was rejected and found that a reference to (root) appeared to be the problem. I removed this and resubmitted. It was accepted.
I suspect that since the syntax change, the theme checker has been upgraded more then once. When you submit a theme, it does indicate the offending lines which is a great help in tracking down the problem.
I am not a developer, so my comments are really just observations.
Hope this helps.