There seems to be a bug in the default Blogger templates that manifests only in some blogs with inline commenting enabled when users try to post comments as anonymous guests. The inline word-verification panel that appears is cropped with no way to scroll down to the textfield to enter the word or to the submit button.
The solution to fix this is simple. Go to the admin console, and navigate to Layout/Edit HTML. Check the tickbox to Expand Widget Templates and search for:
<iframe allowtransparency='true' class='blogger-iframe-colorize' frameborder='0' height='275' id='comment-editor' scrolling='no' src='' width='100%'/>
Change the height property from 275 to 475 and you should be sweet! :-)
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