As regular posters have noticed, the handy tool bar that allowed people to format text in the forum posts has disappeared.
Those who understand HTML can use the tags identified below the comment box to format text crudely.
You tag text like this:
<b> Your text </b>
That would make the text bold. <i> makes italic, etc.
We've no idea at present what has caused the problem and can't say when it will be fixed, unfortunately.