hi, Clive I think it has something to do with the "anti spam filter" of the site, it was happening to me but Parksy fixed it
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I think he is away this weekend but I am sure it can be fixed when he gets back.
BTW, my problems started after replying to a thread, that had web links on every post so by "qouting" more than one links was added every post. sometimes 3 or 4, when submitting the (post) it was seen as spam and chucked into a sand box,
this seems to have triggered a flag on every subsequent post and needed verification before posting every time after that. because my signature was now flagged, something similar could be happening to you, I am sure it is easy to fix,