debug C# toolbar

My C# toolbar has one button. when the button is clicked it generates a file called [login to view URL] the [login to view URL] is HTML that is found within an iframe. To make the process 'easy' I have certain "keywords" that tell the toolbar what iframe contains the source I want. This works great for most sites, but it isn't working properly for one site and I need it fixed. I can give remote access to the machine where the code is installed (any work must be done here). Here's some code currently in use: <[login to view URL]>