Did you clear/refresh browser cache?

Sure, cache cleared and all cache options turned off! several times :)

Which browser are you using?

What is the url.

Might help to have a look

I´m using firefox on a mac, just checked it with chrome and safari, same prob.
url ishttp://www.konkordiawidnau.ch/ you can see the 2 identical navigations on the left!
I have 4 more concrete5 installs, but never had that specific problem.

Enviroment Info:
# concrete5 Version
5.5.2.1

# concrete5 Packages
Amiant CSS3 Menu (0.1), Gallery (1.8), Manual Nav (1.2), Music (1.0.4), Page List Teasers (1.2), Scrollbar (1.0.2), Sortable Fancybox Gallery (1.15).

# concrete5 Overrides
blocks/autonav, blocks/search, blocks/page_list, blocks/jb_scrollbar, themes/konkordia_theme

# Server Software
Apache

# Server API
cgi-fcgi

# PHP Version
5.3.16

# PHP Extensions
bcmath, bz2, calendar, cgi-fcgi, Core, ctype, curl, date, dom, ereg, exif, fileinfo, filter, ftp, gd, gettext, hash, iconv, imap, intl, ionCube Loader, json, libxml, mbstring, mcrypt, mhash, mysql, mysqli, openssl, pcre, PDO, pdo_mysql, pdo_sqlite, Phar, posix, pspell, Reflection, session, SimpleXML, soap, sockets, SPL, SQLite, sqlite3, standard, tidy, tokenizer, wddx, xml, xmlreader, xmlrpc, xmlwriter, xsl, Zend Guard Loader, zip, zlib.

# PHP Settings
log_errors_max_len - 1024
max_execution_time - 5
max_file_uploads - 20
max_input_nesting_level - 64
max_input_time - 60
max_input_vars - 1000
memory_limit - 128M
post_max_size - 16M
safe_mode - Off
safe_mode_exec_dir - <i>no value</i>
safe_mode_gid - Off
safe_mode_include_dir - <i>no value</i>
sql.safe_mode - Off
upload_max_filesize - 16M
mysql.max_links - Unlimited
mysql.max_persistent - Unlimited
mysqli.max_links - Unlimited
mysqli.max_persistent - Unlimited
pcre.backtrack_limit - 1000000
pcre.recursion_limit - 100000
session.cache_limiter - nocache
session.gc_maxlifetime - 7200
soap.wsdl_cache_limit - 5
safe_mode_allowed_env_vars - PHP_
safe_mode_protected_env_vars - LD_LIBRARY_PATH



Thanks for you help!

This install is with a different host than all my previous installs, so could perhaps some server setting cause that?

I'm seeing the second nav in a "sidebar_sub" div.

Try taking it out.

Oh I found the problem! Seems like when I removed it from the stack I didn´t approve the changes. Obviously when you do that it will take effect for the logged in user, but not for guests. I was aware that it is easy to overlook the "approve changes" button, but seems like I still did it!
Thanks for your help anyway! And sorry for bothering you with that stupid mistake!

Okay,

A lesson learned, so you won't do it again.