IE8 Compatibility Mode text input not clickable

Question

When in IE8 and with Compatibility Mode turned to On, the "username" textbox in my form is not clickable, and it's not a JS issue or anything, it works fine in Safari, FF, and Opera just not IE8.

<form method="post" action="" enctype="multipart/form-data" name="index_log">
<input type="text" id="em1" name="em1" maxlength="320" class="re" value="Email" title="Email" style="color: #888888;" />
<input type="password" id="pw1" name="pw1" maxlength="32" class="re" value="Password" title="Password" style="color: #888888;" /><br />
<input type="submit" value="Login" name="log" /> <input type="button" value="Sign Up" id="toggle-status" />
</form>