Just to clarify, this was an upgrade to the vBulletin software for the message board. If you hang out on any other message boards, you might already know that software upgrades are necessary at times to keep the technology current. That includes keeping the site secure from hackers as well as being compatible with the features that TV Guide wants for the site.
We've upgraded the vBulletin on FORT more than once, and there has always been a period of adjustment. There are features we've had that we've had to lose for security reasons (such as instant messaging) and features we've gained (such as the Casino).
Questions about how the buttons will look in the private message interface - the mods here can't really help you with that. It's new to us as well and to any site using the new vBulletin software. Personally, I don't think I have ever sent an image attachment in a PM so I can't just rattle out what button to push. For that kind of problem you have to play with it yourself and see what works.
For any of you who are just now posting that the site is slow for you, make sure you read through the entire thread. Critical had a fix that worked for many users earlier in the thread.