Indeed. According to the manual,

  If your computer has a 64-Bit Operating System, Poser Pro will use its 64-Bit FireFly Render Engine to access as much memory as possible. To utilize the 64-Bit FireFly Render Engine, you must select Render in Background.

I'ld also try my luck with the "Render as an independent process" thingy in the render options tab in preferences.

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