CSRF protection error when security token is being submit.

[Kyojii]

My form below is giving me a CSRF protection error but the security key is being submit with the form, so it shouldn't. I've checked the DOM and the security key is being put in the value field correctly.

<form action="newindex.php?do=submit" method="post">
                        Subject:<br>
                        <input type="text" id="subject" name="subject"><br>
                        <textarea id="article" id="article" name="article"><?php echo $_POST['article'] ?></textarea><br>
                        <div class="sliderimage"><h2 class="blockhead">Slider Image:</h2>
                        <table><tr><td><b>Image:</b><br>Dimensions should be 640x360.</td><td>
                        <input type="file" id="image" name="image"></td></tr>
                        <tr><td><b>Transition:</b></td><td>
                        <select id="transition" name="transition">
                            <option value="">Random</option>
                            <option value="sliceDown">slideDown</option>
                            <option value="sliceDownLeft">sliceDownLeft</option>
                            <option value="sliceUp">sliceUp</option>
                            <option value="sliceUpLeft">sliceUpLeft</option>
                            <option value="fold">fold</option>
                            <option value="fade">fade</option>
                            <option value="slideInRight">slideInRight</option>
                            <option value="slideInLeft">slideInLeft</option>
                            <option value="boxRandom">boxRandom</option>
                            <option value="boxRain">boxRain</option>
                            <option value="boxRainReverse">boxRainReverse</option>
                            <option value="boxRainGrow">boxRainGrow</option>
                            <option value="boxRainGrowReverse">boxRainGrowReverse</option>
                        </select></td></tr>
                        <tr><td><b>Caption:</b></td><td>
                        <input type="text" id="caption" name="caption"></table><br></div>
			<input type="hidden" name="securitytoken" value="<?php echo $bbuserinfo[securitytoken] ?>" />
                        <div class="center"><input type="button" value="Preview" class="preview"><input type="submit" name="submit"></div>
                    </form>