Sorry to bother you again, but here is another problem I've just been "dealing" with that has become increasingly annoying. In the PM module you apparently use the same editor as this one that lets you type about 100 characters wide, but in the PM module you have a blank banner on the right hand side that covers up the last 20 characters. This makes it most difficult to type out and edit a PM.
Yes, I have reset my cache. And this is a Windows XP machine running IE8. But I'm fairly certain I've had the same problem on my Windows 7 machine running Firefox. I also remember reading a PM from someone claiming their "computer was acting weird" because the words they were typing kept disappearing under the banner.
Let me know if you want me to try anything. But I won't be back to my Windows 7 computer for about a week. The problem is on both sites. Thanks.
ETA: I see in the journal module you use the same editor but you make that vertical banner strip go away when the editor is in use. I see that in this thread you use a different editor style and leave the banner strip..... very interesting. Now I can see how that might have happened in the PM module. Anyway, just trying to give you some clues.