Не работает

Requesting support for your issue is a good way of dealing with things like this. Posting a 1 star review instead of reporting an issue, not so much.

Does not work correctly with Russian version of WordPress.
Specifically here, if you write in Russian, and click save then it falls.
https://s2.ipicture.ru/uploads/20140103/WVK4NYZj.png

Can you tell me what version of PHP you’re on, and whether it has the multibyte string functions installed? What actually happens when you use that — how does it fail?

My server https://srv34622.ht-test.ru/info.php
After saving the settings, the plugin works, but the page with the settings in the control panel is not displayed.

That’s a new one! I’ll do some testing and try and find why. I was expecting it was a problem with the operation of the plugin, rather than the settings page; I’ve never had a report of that before.

Thanks for the info; it might be a bit before I have anything to report.

Can’t reproduce this yet, but would like some more info.

– does this happen regardless of what text you place in the field, even if its just a few characters? (E.g. тест)
– does this happen when you place Russian text in other fields in the WP to Twitter settings, or just these?
– does the same thing happen with other multibyte characters, such as Greek? (E.g. δοκιμ?)

Only Russian tried. Yes, one or more words if the numbers enter then everything is fine.

Can you try the Greek word I supplied in the previous message? Also, try adding a Russian phrase into another setting, such as the prefix field, and let me know if it has the same result.