Hi Felix,

i've found the problem. it is located in trac.util.AtomicFile . This
class came with trac 0.11.6 and is called when trac saves the
configuration (with following preconditions: file does not existi ||
not enough permissions) .

AtomicFile gets called but it fails on the tempfile.mkstemp , that
leads to self._file not initialized .

(fd, self._temp) = tempfile.mkstemp(prefix=name + '-', dir=dir) -
'temp file can not be created'

self._file = None helps to prevent unitialized variable .

BR,
Sergey

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