WordPress.org

When I try to upload a favicon, I get the error: "File type does not meet security guidelines. Try another.”
You are probably using a WordPress Multisite installation? Then you'll need to add "ico" to the allowed file types property on the "Super Admin -> Options" page.

Internet Explorer: Why does my favicon show up in the backend but not in the frontend or not at all?
Internet Explorer behaves weird, not only when favicons are concerned. You may take a look at this
FAQ.

Why is All In One Favicon not available in my language?
I speak German and English fluently, but unfortunately no other language well enough to do a translation.
Would you like to help? Translating the plugin is easy if you understand English and are fluent in another language.

How do I translate All In One Favicon?
Take a look at the WordPress site and identify your langyage code:
e.g. the language code for German is de_DE.

1. download POEdit
2. download All In One Favicon (from your FTP server or from WordPress.org)
3. copy the file localization/aio-favicon-en_EN.po and rename it. (in this case aio-favicon-de_DE.po)
4. open the file with POEdit.
5. translate all strings. Things like {total} or %1$s mean that a value will be inserted later.
6. The string that says "English translation by Arne ...", this is where you put your name, website (or email) and your language in. ;-)
7. (optional) Go to POEdit -> Catalog -> Settings and enter your name, email, language code etc
8. Save the file. Now you will see two files, aio-favicon-de_DE.po and aio-favicon-de_DE.mo.
9. Upload your files to your FTP server into the All In One Favicon directory (usually /wp-content/plugins/all-in-one-favicon/)
10. When you are sure that all translations are working correctly, send the po-file to me and I will put it into the next All In One Favicon version.

My question isn't answered here. What do I do now?
Feel free to open a thread at the All In One Favicon WordPress.org forum.
I'll include new FAQs in every new version.