Still can't "reply to all" today. Not sure how long this fixed bug (in mid-Dec) becomes "buggy" again though. It was fine in early January.
Originally Posted by
IB-Dick
We've made a slight change to the "reply to all" function in PMs.
Previously, you couldn't reply to all unless there were three people you were replying to. We've changed that, so you can now reply to all when there are two or more people that are in the chain.
Along with this, the link to "reply to all" is no longer at the top, next to the list of recipients. It is now a button next to the regular reply button.