compilation error with Nightly Build ide

Hello,
I have a problem and don't really know how to solve this. I have installed the Nightly Build (Nov 11th) and when I try to compile or upload it gives me this error

fork/exec /Users/deathwatch/Library/Arduino15/packages/arduino/tools/avr-gcc/4.8.1-arduino2/bin/avr-g++: no such file or directory

With the stable ide 1.6.6 I had the same problem. I have no clue what might cause this because yesterday everything worked just fine.

Any help would be appreciated
Cheers Marco