I have noticed that Bloggers inline comments Captcha appears to be playing up, at least for me recently. The problem seems to happen with both Internet Explorer 7 and FireFox. After typing comments and entering ID the Captcha image fails to appear.
Blogger is a great platform in many ways but it has also had plenty of buggy and flaky moments over the years. Image upload problems used to be a common complaint but it has been a long time since I have had any problems in that area.
Bloggers inline comments setting was a bit flaky in the past after it was introduced but the Captcha has worked without problems before for me. This may take a bit of digging around to find if the problem is my end or with blogger so in the meantime I am going to revert to the older style comments setting.
It would be good to know if others have had problems with the comments Captcha - but of course if you have then you probably wont be able to comment so I wont know! Oh the joys of blogging.