OK, everything seems to be working - but now I've noticed another minor irritation. The title of the thread ("RE: ...") shown above the main quick reply text box is often truncated. Sometimes entire words are simply "lopped off" the end. The trouble is, you can't physically ammend this problem - by clicking on the entry and adding the missing letters!
Presumably this has something to do with the way the board is configured? If so, how come the problem isn't present when replying to post via the conventional route?