Hi,

I'm on Mac OSX 10.7.3 TM 2.0 (9100).

If the text buffer begins with a combining character (diacritica) you cannot delete that character, select all also doesn't work. To reproduce it, simply open a new document, open the Character Viewer, and insert let's say a combining acute accent U+0301 or in UTF-8 CC 81, then type something, and press CMD+A to try to select all, this fails. You can delete the typed characters up to the first character.

Cheers, --Hans