Serendipity 
The final prime factorisation is now failing me as well
I was expecting [2,2,3]
Have I mis-typed this one?
[edit] I wonder if it's down to recent change in the reshape reporter?
[edit2] No - its down to issue with how many times reporter again - it's saying 3 is used as a factor of 12 three times!
[Edit 3] #LOL and now Brian's works (as it of course it should when you follow the rabbit down the recursive hole)
I can now get back to the problem that I wanted this block for