Wrong Wiki-Names from mail Parameter

Edit: Looks like I found a solution to this: I needed to delete the Cache File: "/working/work_areas/LdapContrib/cache.db" and do a cache-refresh from within the Wiki. Just refreshing the Cache (which I did probably 100 times) did NOT work. Only after deleting the Cache-File it worked.

Still don't know WHY it did not work, but at least it is solved now.

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We have two Foswiki 1.1.2 Setups on the same server (one test and one productive). This used to work without a flaw in the past. But now, after upgrading both setups to 1.1.2 we experience a strange behaviour on our Test-Setup with the Ldap-Extension.

We use to take the Users E-Mail as WikiNameAttribute. If a user with the email "oliver.schaub@..." and the login "schaub_o" is loggin in, his Name should be displayed as OliverSchaub. But it is actually displayed as "Schaub O" and a User-Topic "SchaubO" is created in the Main-Web. So it looks like Ldap-Contrib is using the LoginAttribute instead of the MailAtrribute for the WikiName... This is strange, since we use the EXACT same configuration on our Productive System.

$Foswiki::cfg{Ldap}{UserScope} = 'one';
$Foswiki::cfg{Ldap}{LoginAttribute} = 'cn';
$Foswiki::cfg{Ldap}{MailAttribute} = 'mail';
$Foswiki::cfg{Ldap}{WikiNameAttributes} = 'mail';
$Foswiki::cfg{Ldap}{NormalizeWikiNames} = 1;
$Foswiki::cfg{Ldap}{RewriteWikiNames} = {
'^(.*)@.*$' => '$1'
};
$Foswiki::cfg{Ldap}{NormalizeLoginNames} = 1;
$Foswiki::cfg{Ldap}{WikiNameAliases} = '';

I enabled debugging and got the following lines in the Apache-Error Log: LdapContrib - called getWikiNameOfLogin(schaub_o)
Shouldn't this be "getWikiNameOfMail" or something like this?

What could cause a behaviour such as this? Since it is working perfect on our Production-Setup and the Ldap-Setup is exactly similar on both Setups, I suspect some other Extension/Configuration which is somehow messing it all up.
Are there any known issues with other Extensions? What configuration besides Ldap-Configuration could have an Influence on this?

I'm going through our setup now step by step trying to figure it out... but I would be very thankful for any tip that might push me in the right direction.

Thanks a lot,

Oliver