gitk error on cygwin

Hi,
While browsing revisions in gitk on a windows xp machine and cygwin version (I tried both the packaged and a compiled one) I always find tis error:

fatal: write failure on stdout: No such file or directory

fatal: write failure on stdout: No such file or directory
while
executing
"close $bdf"
(procedure "getblobdiffline" line 12)

invoked from within
"getblobdiffline file102f41f0
5978405b2bdf0c43c3b49427b0167eb31d433fe4"
("eval" body line 1)

invoked from within
"eval $script"
(procedure "dorunq" line 11)

invoked from within
"dorunq"
("after" script)

After this gitk
becomes unstable and doesn't show diffs,
Thanks,
Frank

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