James,<br><br>Which version of Control.Monad.State are you importing?<br><br>If you&#39;re just importing vanilla Control.Monad.State, that&#39;s actually sending you to Control.Monad.State.Lazy.<br><br>Using Control.Monad.State.Strict might solve your problems, srsly.  Laziness can result in epically failing memory leaks.<br>

<br clear="all">Louis Wasserman<br><a href="mailto:wasserman.louis@gmail.com">wasserman.louis@gmail.com</a><br><a href="http://profiles.google.com/wasserman.louis">http://profiles.google.com/wasserman.louis</a><br>