Yes there is a typo here, edit the file ListingOptionsAdm.pm, line 101, edit this line:
$Config{Thumbnail_Heigh} = $Param{Thumbnail_Heigh};
to :
$Config{Thumbnail_Height} = $Param{Thumbnail_Height};
Only missing the letter "t" in Thumbnail_Height
Thanks
Mewsoft Support www.mewsoft.com