You may find yourself bumped to an empty classifiedcampers website -- hence the suggestion to empty cookies.
There may be other errors that need fixing or text and forum layouts that need changing.
I've pretty much done this without taking the site offline, and therefore going to fix and readjust everything over the next few days -- so don't worry too much about anything that isn't working properly, yet.
Just to add, again -- please don't be tempted to hit the subscribe button just yet. It will work and I will get the money, but if you wish to donate then please hold back as I will be changing everything over the next few days, including reducing the number of adverts etc.