On the reply window, there is the A/A option on the menu. You might try using that to change to a different mode to see if it helps. I have gotten where if I run across the situation where the bold won't turn off, I can use that and manually change the codes.
It does make a difference if you are running Windows 8 as to whether you can use the standard editor or wysiwyg.
A browser comes with certain Java elements by default that can be enabled or disabled. By installing Java you would be increasing the database of Java elements available for any Java based Webpage to use.