General Support: Comments form and captcha not working in Lucid theme!

Hi

I have installed plogger 1.0 RC1 successfully today and overall its working quite well!
However, in lucid theme while adding comments the captcha image is not
generated properly (checkout the following) :

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http://www.kabhinav.net/plog-includes/plog-captcha.php
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Also, when I tried to comment the captcha code and use the form
simply then I got the following error message:

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Comment did not post due to the following errors:
? Spam token missing or does not match!
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I also got the same error message after switching to default 'classic' theme.
For the time being I have disabled the user comments and would
really appreciate any help to make it working!!!

Thanks.

Abhinav