Whenever I press the down arrow when I am writing a comment this automatically posts the comment. This is very annoying behaviour as I normally navigate the comment to correct the (many) typos I make while writing the comment. As soon as I hit down it posts, meaning I have to edit the comment if am not ready.

Urg. This is my fault for not going a double checking what the cause was! I tend to use the context menu key to correct typos. Context key, select word, enter. The normally I will press down to get to the end of the row. Enter in the context menu posts (with about a 0.5 second delay so it does it just as I press down!!). This one is real! Honest!

Can this be turned off?