Change your password and untick the box that keeps you logged in all the time. You'll have to login each time you want to post something, but it's way better than having some retard posting stuff as you.
Otherwise, SpankMe can grab the ip of who posted that message and see if it was in fact someone you work with (it will match other posts of yours from around the same time) or if someone hacked your password (ip will be completely different to yours around that time).
I'd also advise a major bout of antispyware/virus scanning. You might have a keylogger on that machine (funnily enough, I used to have 1 at my old workplace that I installed so I could find out when someone was being a wanker and using my machine for something).
Lastly, the server might have had a brain fart. Happens occassionally, but usually when it does happen, the person posting usually ends up posting as a Guest - which is impossible to do in theory. But who knows what happens when a machine brain farts.
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