Hi Jon,
I don't know for sure if long lines cause problems. It was just a guess.
I use textpad, available at www.textpad.com, an editor which does syntax coloring (I load the source into it). The rest is done by a long-trained eye to spot problems
I do not use Netscape, so I don't have any knowledge why the problem disappears when reloading (could the long lines cause any transmission errors?)
On first glance, I do not find any severe errors in your page (only your table: borders is an argument expecting a value - although most browsers assume some default value other than 0 if no value is given).
But I did not check every single data cell or data row.
cu
MudGuard