1. Bold button doesn't work/non-responsive (maybe others as well) - unless the word/sentence is selected beforehand. Pressing on the bold button without selecting anything doesn't respond.
2. Impossible to change cursor position. For example, users can't put the cursor in the middle of a random word in a sentence. The cursor goes only at the beginning of the word or at the end.
3. When there is scrolling inside the editor (a long paragraph/message), in order to scroll, while composing a message/thread, one should press and hold the display in order to see what he/she wrote at the end of the paragraph/message. Once this user stop holding the display, it jumps back to the beginning of the paragraph.