fjtorres...
1- Latest firmware? -Yes.
2- I use only FB Reader
3- Tries ePub with both FBReader and Adobe Reader. The line-ending problem appear with FB Reader. For Adobe Reader, I got squares

4- Tried ePub and FB2 on PC? No.
5- My Thai ebooks are home-made and usually converted by Calibre. But I get HTML and RTF directly from MS Word.
7- Most of original format is DOC. Sometimes PDF.
6- Tried them all. In short, if the lines aren't cut, I'll see only squares or pages of question masks
I forgot to indicate that some alphabets are cut too. The are not so many but still...
Anymore suggestions?
Somehow I think the problem probably is that Thai don't have ANY indication where a word (and sentences) will start nor end. Just have to read it. I don't know but I'll keep trying anyway...