Comments module - captcha image with wrong link

[sailit]

I have an error on comments module:

I'm new with CMS and now I have installed comments module.

Someone can help me ? I can't view the captcha picture because the link to image.jpg is:

http://mysite/cmsnewtmpcacheb2evo_captc ... ddc32d.jpg

I think I have:

http://mysite/cmsnew/tmp/cache/b2evo_ca ... ddc32d.jpg

There aren't any "/" in the link.

Why I have this kind of link?

Where I set-up and fix it ? in comments module ? and how ?

Thank you