Hi Darren,
I think I am also facing the same issue recently even though I am not a new member. To reduce the number of postings, I tend to group the items together and sometimes the post title could be the same or similar. After clicking submit, everything went as per normal, no error message or anything and I even got a message of "Thanks for submitting your post" but after redirecting me to the relevant B&S section, my post was not shown and checking on my latest posts also revealed nothing. But I have success when the title is a bit more different from past posts. I am not too sure if this is the same problem as those faced by the new members. Could you pls advise?
A suggestion: if the server deems a post as suspect or spam, could you set it such that a notification or message is shown where the poster is informed that the post is kept under review and would be released upon review? Then at least the poster would know what happened and not keep wondering on what went wrong.