Ok it looks like it's a problem with the new web server we're using. (litespeed instead of apache).. I'm guessing it's just a problem with the rewriting rules. I've added it to the todo list
We could be looking at getting another server upgrade (it's about that time) so i think we'll have enough headroom again to go back to apache.
The reason why it 'sometimes' works in a new browser is in the new browser window instead of typing in the 613 domain as .net your using the old .com (we're trying to move the site to .net and discontinue .com) however .com still runs on apache so it's working fine.
So..
[
www.plus613.com] works fine..
[
www.plus613.net] wont..