Enabling Gmagick PHP module causes ImageMagick (Imagick) module to report 0 supported formats

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http://serverfault.com – I'm trying to get both imagick and gmagick extensions enabled on the same machine (ubuntu 12.04 - though same problem in older versions). I have a working ImageMagick/Imagick installation - with 206 supported formats...up until the moment I enable the gmagick module - then it reports that 0 are supported. I was able to isolate the problem thanks to this response: http://stackoverflow.com/a/11350707/543871. With gmagick enabled, graphicsmagick works perfectly well, just at the expense of imagemagick. Any ideas? Here is the output from phpinfo before and after enabling gmagick: BEFORE (just (HowTos)