Does Gajim support Off The Record encryption (OTR)?
Support for OTR was dropped in Gajim 1.0. There is an OTR plugin for Gajim 0.16, which is based on the Pure Python OTR. Use of this plugin is discuraged, as it is not maintained. The OTR plugin was not ported to Gajim 1.0. Instead, you could use OMEMO or PGP.
How can I use the Advanced Configuration Editor (ACE)?
Please read our section about the Advanced Configuration Editor. By using ACE you can access all settings, including options not displayed in Preferences window.
Gajim is translated to lots of different languages.
For GNU/Linux systems prefix your Gajim invocation with LC_MESSAGES=YOUR_LOCALE to something like LC_MESSAGES=de_DE gajim. To find a suitable locale, issue locale -a.
For Windows you have to setup an environment variable called LANG with a locale value (e.g. de_DE for german):
From the desktop, right click My Computer and open Properties. In the System Properties window, click on the Advanced tab.
In the Advanced section, click the Environment Variables button.
Finally, in the Environment Variables window, click to add a local variable called LANG and set it to de_DE or the language of your choice.
For more informations on how to set language options (advanced stuff) see this tutorial
I want to know if SSL or TLS is activated
In your account line (in the roster), you can see a key: that means you use SSL or TLS. Gajim never connects without SSL/TLS without asking you first.
Unintended behavior and errors
Ctrl + Tab acts in a unique way
Ctrl + Tab is a shortcut key to go to next unread tab or next composing tab if there is no unread tab. You can disable "going to next composing" in the Advanced Configuration Editor.