I entered it correctly at least, at least ten times before it finally said it was right.
I don't know if "JForum" can use something else, but I'd highly suggest seeing if it does. I'd bet money, that half of the people who try to register here just don't bother after that many rejections(assuming it's always this bad).
I fully understand. I made a "temporary" site on phpbb and then it ended up being fairly active and I hated it so much. But I was afraid to switch because then you lose everything on the old forum. I eventually did switch to e107, but it did hurt activity. A few of the older semi-active posters just gave up when they lost their old ranks. Whether or not the switch was a good idea, I can't say for sure. I just wish I'd picked e107 from the start.