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I got this error message when using captcha hn_captcha but using GD captcha it seem fine.
But GD captcha unable to custom.
I use it for form builder.

Notice: Undefined index: path in myweb\modules\Captcha\lib\classes\captchalibs\class.captchalib_hncaptcha.php on line 50

What could be the wrong for this?
Is not compatible with form builder?

I have an identical error, running CMSMS version 1.7.1 with Captcha 0.4.1

See this post for more information: http://forum.cmsmadesimple.org/index.php/topic,45180.msg214967.html#msg214967

It's "only" a notice from php - you have to modify the error level like in announcement for version 1.7 suggested.