"Static planes value not equal to 1"

[MK <halfcountplus intergate com>]

i have some short text files (literally just lists of fully qualified  
file pathnames) put out by a basic perl routine that will not display  
in the mc viewer because

identify: Length and filesize do not match 'file.txt'.
identify: Static planes value not equal to 1 'file.txt'.

leading to "Empty output from child filter"

However, MOST of the files from this routine are fine, and in any case  
they ALL display without complaint in vim, gedit, cat, less, and  
fulfill their purpose within perl.  But i like to be able to view them  
my usual way of course and this message is disturbing to me...i can  
find no informative reference to "Static planes value", etc.

What does this mean?