Hey Mark, thanks for the reply.
Regarding your questions, the same thing happens to everyone: whenever you are reading a private message and click reply (or any of the other options) your are instantly and with no warning, taken to your private message inbox again. Just like that.
Hopefully, our site should be updated by tomorrow and if we’re fortunate this bug will be removed. However, while reviewing the faulty topic, we have decided that we’d prefer to keep private conversations between users between themselves, so we’ve hidden all the PM user interface, allowing users to only communicate by email. This means that I will most likely not be giving EE support more feedback about this particular situation.
Someone who has modded the style of the buttons in our site suggests that the issue could be related to faulty functionality on such modification. This could be the issue, meaning that EE code would be just fine. however I suggest a bit of debugging to make sure it is.