Please create a bugzilla when you run across this sort of thing. Also please ensure the bugzilla is public so all of us can see the bug and track its progress. Dev team members don't often read forum threads, but they do read bug reports.
@RodrigoMoya The Time Profiler was actually working fine for us. Very disappointed in the decision to disable it completely. Would it not have been better to just add a warning about its instability?
I am also interested in knowing the answer to this question. I have some important things to plan late this year and early next year and would like to plan accordingly.
If anyone who has installed SDK Build-Tools verison 21 is running into this issue on Windows, try uninstalling version 21 and installing SDK Build Tools 21.0.2. From stackoverflow.com/a/26441954/89590