Cody Konior notes that upgrading from CTP 3.0 to CTP 3.2 can cause SQL Server R Services to break:
If you were using CTP 3.0 and later ran an in-place upgrade to CTP 3.2 this will silently break R Services. Uninstalling and reinstalling the R component will not fix the problem, but it can be fixed. There are a few interrelated issues here so bear with me.
Hopefully you don’t run into this issue, but if you do, at least there’s a fix.