No developer is able to reproduce this. So unless you can track this 
down yourself we can't do anything about that issue.

I don't think so
Did you try logging out AFTER you clicked the AddressBook? All 
operations work fine but when you are in the Turba pages and try to 
logout, you get the error.

Any chance that this is a duplicate of bug #6673 and fixed with the 
patch linked from that ticket?

For my Horde Groupware Webmail config it's enough to login (auth by 
imap) and logout and do nothing between this two actions to provoke 
this token-error. I'm using MySQL for storage, sessions and tokens, 
too. I think the problem is, that only sessionhandler-table is set to 
InnoDB engine, and so there are row-lock problems. The token-table 
uses MyIsam, so I changed it to InnoDB (ALTER TABLE horde_tokens 
ENGINE=InnoDB;) and it seems to works. By the way I've applied this 
engine to all tables.

I have figured out exactly what is wrong, but I don't know how to fix 
it. Here is how you get to the error:



On Horde's Custom Session Handler setup tab, choose the MySQL session 
handlers then save the config. This setting causes the error. I also 
noticed the check for enabling row-level locking. Disabling this gets 
rid of the error but then you get a different error and your Address 
Book disappears and you cannot create a new one.

upon further investigation, I found that Address Book functionality 
doesn't work either. For example, adding a contact gives the same 
error message. I also found these errors in httpd log:



[Wed Jun 11 14:17:44 2008] [error] [client 192.168.110.33] PHP 
Warning:  mysql_error(): 18 is not a valid MySQL-Link resource in 
/var/www/html/horde/lib/Horde/SessionHandler/mysql.php on line 173, 
referer: 
https://pop.domainname.com/horde/index.php?url=https%3A%2F%2Fpop.domainname.com%2Fhorde%2Fimp%2Fmailbox.php%3Fmailbox%3DINBOX%26mailbox_token%3D851e7112c2ee85c092533ebed502b569

[Wed Jun 11 14:17:46 2008] [error] [client 192.168.110.33] PHP 
Warning:  mysql_error(): 18 is not a valid MySQL-Link resource in 
/var/www/html/horde/lib/Horde/SessionHandler/mysql.php on line 173, 
referer: 
https://pop.domainname.com/horde/imp/mailbox.php?mailbox=INBOX&mailbox_token=851e7112c2ee85c092533ebed502b569&frameset_loaded=1

[Wed Jun 11 14:18:06 2008] [error] [client 192.168.110.13] PHP 
Warning:  mysql_error(): 18 is not a valid MySQL-Link resource in 
/var/www/html/horde/lib/Horde/SessionHandler/mysql.php on line 173, 
referer: https://pop.domainname.com/horde/services/portal/sidebar.php

I was using SQL token but tried the filesystem token and even 
disabling it but logout still didn't work. Log file didn't show 
anything because I think this isn't really an error, it's something 
that just doesn't work. Are you using the stable Horde Groupware 
Webmail Edition 1.1 with MySQL?

Works fine here, no matter which token driver I configure in Horde. 
Try looking for errors in the log files and try to configure a 
different Token driver.

Clicking on the "Log Out" button from any Address Book option screen 
gives an error "Required secret is invalid - potentially malicious 
request."



Steps to error:



1. Click Address Book

2. Click Options

3. choose and click one of the Options for Address Book

4. click the Log Out button