I do not know if I have the same problem as Khode but IƤll use this thread anyway.
	 
	I can not run any challenge checker at all.
	When I press the Run checker-button on for instance this checker:
	http://project-gc.com/Challenges/GC469TF/3
	I first get is a spinning "working-circle",
	then I get the message "Error: Failed to execute script"
	The rest of the fields below are empty.
	Execution time (s) 
	Peak memory usage (kB) 
	Error message 
	Execution status 
	Script exit code 
	Error log
	Script output
	The same behavior for all challenge checkers...
	The autocheckers in the map views are still working and gives a green checkmark for the checkers I pass and a stop sign for those I do not pass.