If you changed a server setting, did you restart Apache?
Change the theme (especially if you are using custom theme)
Try to reproduce the problem on a Tiki demo site. If you can reproduce, then, please report a bug
Activate debugging/logging tools
YAML
preferences:
error_reporting_level: 2047 #Full
error_reporting_adminonly: n #Not just for admins because we could be testing as Anonymous
smarty_notice_reporting: y
log_sql: y #logging sql queries
log_mail: y #logging sent email
log_tpl: y #add comments in templates (if you click view source, you can see which tpl was used to create it
feature_debug_console: n # [http://dev.tikiwiki.org/Debugger+Console|Debugger Console]
smarty_security: y # it was required to turn off for debug console, but now we can restore.
feature_bot_bar_debug: y
use_minified_scripts: n # to use compressed version of scripts, when available for faster performance but not so useful for debugging.
style: thenews.css
feature_wiki_1like_redirection: n #Tiki tries to be smart but this can be annoying because it prevents error messages on typos