Any suggestions for captcha for registration?

I am using trac-0.12.2_1 from FreeBSD ports.

I downloaded the zip from http://trac-hacks.org/wiki/CaptchaAuthPlugin

and after unzipping I ran "python ./setup.py build" (I had to make some 
files readable first with chmod u+r).

I installed with "python ./setup.py install" as root.

The documentation didn't say how to enable it nor install it. So I 
guessed.

I configured my trac.ini components section with:

captchaauth.* = enabled

I restarted my webserver. LOading trac said I needed to upgrade trac, so 
I did. A minute later ...

The register page added the captcha form. It is hard to read for me.

I attempted to do a registration test, but failed saying I needed to 
include an email address even though it said it was optional. But the 
new page asked for the captcha but didn't show the image. So I reopened 
the register page. I tried again ( I had to retype each field) and 
failed again saying email address was already used (it was). Then tried 
again and failed because I couldn't read the captcha so entered the 
wrong information. And tried again (after reopening the register page so 
I can see the captcha image) and retyped all again. Then it popped up a 
browser authentication login window. I typed in my new username and 
password. Then the browser complained:

        The page isn't redirecting properly

The logs showed it tried to load the login page about ten times within 
one second. So I disabled the component and restarted. I was logged in 
as my new test user automatically.

Any suggestions on how to configure a registration captcha? or a 
different plugin I should use?

We get five to 25 spam registrations each month and we want to limit 
them. I am guessing these are automated registrations.

I can't log out -- that it the logout works but I press login and I 
don't have to retype any credentials. Even if I close the browser tab 
and reload the webpage. This does not seem secure at all -- how to use 
this trac on somebody else's browser if I can't log out? How can I 
switch back to my correct user account? (This is unrelated to the 
captcha plugin issues.)

  Jeremy C. Reed

echo 'EhZ[h ^jjf0%%h[[Zc[Z_W$d[j%Xeeai%ZW[ced#]dk#f[d]k_d%' | \
  tr            '#-~'            '\-.-{'

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