Due to a bug in compileall.py script distributed with Python pyc/pyo files’ modification times are earlier than tat of py files. If any Python packages (such as java-config which is used for all Java packages) are used during compile phase the bytecode is regeneretad and sandbox-1.3.3 started catching that as a violation. Sandbx version 1.3.4 and above ignores this problem as a workaround. So if you hit any issues similar to bug 256953 or its duplicates, please update your sanbox. I thank Martin von Gagern for working on fixing the issue and taking it to upstream.