nicoverduin:
Just checked but it looks correct
D:\Arduino\hardware\arduino\sam\variants
wierd.
Easiest to track down the problem would be to debug. I have searched again and the only location I can find where this environment variable is set is in the method setTheEnvironmentVariablesPostProcessing in arduinohelpers.java.
Easiest would be to debug the code. I'm sure you can do so.
Is there anything special to the d drive? Such as cloud drive or linked drive ...
Best regards
Jantje