I just tried updating to ImageMagick 6.5.9-5-Q16 and that didn't make any difference.
Todd P.S. FYI - in the process of installing Lyx there was an error related to writing a file. Any of the "..." below are too long for me to write. Error opening file for writing: MiKTeX 2.5SystemAdmin yesPowerUser noSharedSetup BinDir... binOS... Root0... Root1... Root2... UserData... UserConfig... fndb0... fndb1... fndb2... fndbmpm C\Documents and Sett\dvipost.sty I had the option of choosing "Abort", "Retry" and "Ignore". "Retry" would give the same error, so I went ahead with "Ignore".
