I can get the fatal error on demand, and make it go away, on demand.  If my browser, any browser, has been completely closed, and I open it and go to 
Welcome to Club Cobra...The world's largest non-biased Cobra site! - Club Cobra I almost always get this error message:
Fatal error: Out of memory (allocated 1835008) (tried to allocate 98304 bytes) in F:\Inetpub\wwwroot\clubcobra\forums\includes\funct  ions.php on line 2836
Regardless of how many times I refresh that tab, I get the same error.  But if I then open a new tab and go directly to a single post, which then shows me as being logged in, I can then refresh the first tab and it will get right through, but with a parse error like this:
Parse error: syntax error, unexpected $end in F:\Inetpub\wwwroot\clubcobra\forums\includes\funct  ions.php(5723) : eval()'d code(17) : eval()'d code on line 3
It is easily repeatable and, if I had to guess, I would say it has something to do with the server software noting that you are logged in, as opposed to not being logged in, and attempting to display the page accordingly.