It seems that one of the fixes in the new Movable Type release is with ReCaptcha. There’s even instructions for installing, which had been missing until this latest release.
If you’re using reCaptcha version 0.2, there’s no need to edit the perl file. Keys for reCaptcha are entered in the System Plugin Settings.
If you follow the instructions provided in the readme file included with version 0.2 you’ll find it should work correctly.
To change the colour scheme for the reCaptcha image, add the following just above the <div id="comments-open-captcha">:
<script type="text/javascript">
var RecaptchaOptions = { theme : 'white' };
</script>
Test different colour names, white works for me and blends with most template colour schemes.
Good Time