I think it's only since the last update (or the previous one) that I have this problem: I add text in Arabic to a pdf and it looks ok. After saving and reopening the file, the text has turned into random Latin characters.
I always rush to install the latest version, so I don't know if this has been happening since one or two updates ago. It's indeed quite a new thing.
Otherwise I love pdf24 and I'd hate to migrate anywhere else.