[ 1286024 ] plot2d cannot create maxout.gnuplot

hello,

does someone know what's going on here?
see: http://sourceforge.net/tracker/index.php?func=detail&aid=1286024&group_id=4933&atid=104933

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(C1) plot2d(x,[x,0,1]);
(D1) ---> OK. plot is done
(C2) plot2d(x,[x,0,1]);
Maxima encountered a Lisp error:

Error in CATCH [or a callee]: Cannot create the file
maxout.gnuplot.

Automatically continuing.
To reenable the Lisp debugger set *debugger-hook* to
nil.

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thanks for your help,
robert dodier