Post any defects you find in the released or beta versions of the ImageMagick software here. Include the ImageMagick version, OS, and any command-line required to reproduce the problem. Got a patch for a bug? Post it here.
I notice an explanation for seeding the random number generator using "-seed" at THIS link. It mentions how you should be able to unset the seed number using "+seed". This will fail using IM 7.0.7-8 on Windows 10 64 command line and scripts. Here is a command that generates the error...