I just found something strange in my logs as I didn't check them for some time.
I updated today to 1.1.1.1 from 1.0.3.1 so I did view some logs by the way and it seems that since January 2013 Polish letters are saved as normal letters. For example 'a' instead of 'ą', 'z' instead of 'ż', 's' instead of 'ś' etc. The only letter not converted is 'ó'.
The new version also converts those letters.
I'm not sure, but maybe there was some Windows update that broke it. And it could have something to do with UTF-8 coding.
Here are suspected updates: http://i.imgur.com/w96Pof2.png
I didn't reinstall the system and didn't update Anuran since 2011, so I don't know what else could it be :/
I use Windows 7 x64 English version set to Poland in regional settings.

I'm going to install system on new disk soon and will post some updates then.

No, only Anuran.
Whole Windows XP SP3 is Polish with most commonly used Polish Programmers Keyboard setup.
Sometimes, rarely some programs (I had similar problem with English version of MSOffice, and Notepad++) have problems with altgr, usually when they use hotkeys with alt.
Maybe it's the same this time that Anurans edit control use those. But I turned off any hotkeys in Anuran but it didn't help.

Also strangely it started to put 5 new lines, after one enter keypress. After I switched it to ctrl+enter as new line it was ok. After changing it back to enter as newline it's again 5 new lines :/
Even more strangely after restarting Anuran it came back to normal :)
Halloween or sth? ;)