There are still some problems with forum pages being loaded from the computer's cache and not reloading properly. Until the computer geniuses at Sparklit (third party hosts of the forum) sort the problem I suggest hitting Ctrl F5 (that is the Ctrl key and the function key F5 at the same time) when a page does not appear to load properly.

This is the cause of new posts seeming to disappear, the member reposting and then both posts mysteriously reappearing.