looks like perhaps wishlist member is redirecting? or you have some other redirect via other plugin or .htaccess… see the http headers below… you are getting on your server a 302 redirect (temporarily unavailable) on the forum page when the logout redirects there…
http://www.nonprofit-software.co/wp-login.php?action=logout&_wpnonce=9d96544063
GET /wp-login.php?action=logout&_wpnonce=9d96544063 HTTP/1.1
Host: www.nonprofit-software.co
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0) Gecko/20100101 Firefox/12.0
Accept: text/problem-with-post-edit-buttontml,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: keep-alive
Referer: http://www.nonprofit-software.co/resources/forums/
Cookie: __utma=104938012.2112935331.1335070026.1335132834.1335405661.4; __utmz=104938012.1335405661.4.4.utmcsr=simple-press.com|utmccn=(referral)|utmcmd=referral|utmcct=/support-forum/sp5-general-topics/login-redirect/; wordpress_logged_in_dc7ea05b17e5654af396782c145e91d3=SimplePress%7C1336342453%7Cd50f89677c7c04e613cec77eba8cb755; sforum_dc7ea05b17e5654af396782c145e91d3=SimplePress; wp-settings-time-3=1335405690; __utmb=104938012.2.10.1335405661; __utmc=104938012; WLMSequential_3=1
HTTP/1.1 302 Moved Temporarily
Date: Thu, 26 Apr 2012 02:03:41 GMT
Server: Apache/2.2.22 (Unix) FrontPage/5.0.2.2635
X-Powered-By: PHP/5.3.8
Expires: Wed, 11 Jan 1984 05:00:00 GMT
Cache-Control: no-cache, must-revalidate, max-age=0
Pragma: no-cache
x-frame-options: SAMEORIGIN
Set-Cookie: wlmdebug=deleted; expires=Thu, 01-Jan-1970 00:00:01 GMT
Set-Cookie: WLMSequential_3=1; expires=Thu, 26-Apr-2012 02:08:43 GMT
Set-Cookie: wordpress_test_cookie=WP+Cookie+check; path=/
Set-Cookie: wordpress_dc7ea05b17e5654af396782c145e91d3=+; expires=Wed, 27-Apr-2011 02:03:43 GMT; path=/wp-admin
Set-Cookie: wordpress_sec_dc7ea05b17e5654af396782c145e91d3=+; expires=Wed, 27-Apr-2011 02:03:43 GMT; path=/wp-admin
Set-Cookie: wordpress_dc7ea05b17e5654af396782c145e91d3=+; expires=Wed, 27-Apr-2011 02:03:43 GMT; path=/wp-content/plugins
Set-Cookie: wordpress_sec_dc7ea05b17e5654af396782c145e91d3=+; expires=Wed, 27-Apr-2011 02:03:43 GMT; path=/wp-content/plugins
Set-Cookie: wordpress_logged_in_dc7ea05b17e5654af396782c145e91d3=+; expires=Wed, 27-Apr-2011 02:03:43 GMT; path=/
Set-Cookie: wordpress_logged_in_dc7ea05b17e5654af396782c145e91d3=+; expires=Wed, 27-Apr-2011 02:03:43 GMT; path=/
Set-Cookie: wordpress_dc7ea05b17e5654af396782c145e91d3=+; expires=Wed, 27-Apr-2011 02:03:43 GMT; path=/
Set-Cookie: wordpress_dc7ea05b17e5654af396782c145e91d3=+; expires=Wed, 27-Apr-2011 02:03:43 GMT; path=/
Set-Cookie: wordpress_sec_dc7ea05b17e5654af396782c145e91d3=+; expires=Wed, 27-Apr-2011 02:03:43 GMT; path=/
Set-Cookie: wordpress_sec_dc7ea05b17e5654af396782c145e91d3=+; expires=Wed, 27-Apr-2011 02:03:43 GMT; path=/
Set-Cookie: wordpressuser_dc7ea05b17e5654af396782c145e91d3=+; expires=Wed, 27-Apr-2011 02:03:43 GMT; path=/
Set-Cookie: wordpresspass_dc7ea05b17e5654af396782c145e91d3=+; expires=Wed, 27-Apr-2011 02:03:43 GMT; path=/
Set-Cookie: wordpressuser_dc7ea05b17e5654af396782c145e91d3=+; expires=Wed, 27-Apr-2011 02:03:43 GMT; path=/
Set-Cookie: wordpresspass_dc7ea05b17e5654af396782c145e91d3=+; expires=Wed, 27-Apr-2011 02:03:43 GMT; path=/
Last-Modified: Thu, 26 Apr 2012 02:03:43 GMT
Location: http://www.nonprofit-software.co
Content-Length: 0
Keep-Alive: timeout=5, max=400
Connection: Keep-Alive
Content-Type: text/problem-with-post-edit-buttontml; charset=UTF-8
———————————————————-
http://www.nonprofit-software.co/
GET / HTTP/1.1
Host: www.nonprofit-software.co
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0) Gecko/20100101 Firefox/12.0
Accept: text/problem-with-post-edit-buttontml,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: keep-alive
Referer: http://www.nonprofit-software.co/resources/forums/
Cookie: __utma=104938012.2112935331.1335070026.1335132834.1335405661.4; __utmz=104938012.1335405661.4.4.utmcsr=simple-press.com|utmccn=(referral)|utmcmd=referral|utmcct=/support-forum/sp5-general-topics/login-redirect/; sforum_dc7ea05b17e5654af396782c145e91d3=SimplePress; wp-settings-time-3=1335405690; __utmb=104938012.2.10.1335405661; __utmc=104938012; WLMSequential_3=1; wordpress_test_cookie=WP+Cookie+check
HTTP/1.1 200 OK
Date: Thu, 26 Apr 2012 02:03:43 GMT
Server: Apache/2.2.22 (Unix) FrontPage/5.0.2.2635
X-Powered-By: PHP/5.3.8
X-Pingback: http://www.nonprofit-software.co/xmlrpc.php
Set-Cookie: wlmdebug=deleted; expires=Thu, 01-Jan-1970 00:00:01 GMT
Keep-Alive: timeout=5, max=399
Connection: Keep-Alive
Content-Type: text/problem-with-post-edit-buttontml; charset=UTF-8
Content-Length: 54819