mark as unread symbol missed

I have button in my toolbar mark as unread. Today I updated to 4.2.12.4. The symbol for this button disapeard. Now there is still the text mark as unread. Current version is 4.2.10.0 | 'Using TBUDL' information:

Text vs HTML word wrapping

Fellow Batties, I just noticed something which I don't quite understand. I received an HTML message which displays properly, in that the text does not go all the way to the end of the screen. However, if I click on REPLY, the resulting HTML reply screen has the text of the original message