Sorry for late reply - been busy... OK, I'll try unticking the html box see if that works...
The other obvious question/s that this gives however, is that does this 'problem with the html box' only happen with forums on sites that are not yet published (mine isn't yet as I'm still working on it offline), because if it also happens on sites that are published, then this could happen to any member of forum that wants to edit a post, only they will not know that the problem lies with the html box ticking itself - probably they wouldn't know what's going on and just come to the conclusion that the forum isn't setup right...
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Update.... Where is the html box, I couldn't find it.
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OK, I found the html box and unchecked it. That worked