Error (probably ldap) when launching firefox

Hi,

  I have strange error when launching my freshly downloaded firefox.
The message is

thunderbird-bin: sockbuf.c:91: ber_sockbuf_ctrl: Assertion `(
(sb)->sb_opts.lbo_valid == 0x3 )' failed.
/usr/bin/thunderbird: line 251: 24316 Aborted
$MOZ_PROGRAM $MOZ_LANG

 I know it's probably not thunerbird's fault but due to some system
mis-configuration,  but what I need is a good idea in which libraries
to start searching for a version clash...  is this concerned with ldap?
 with what part of it?  what function is called from which module?

  many thanks

     mfeldt