Hi Steve,
The first error was something kind of odd. Basically I tried one of my templates and would get the following error everytime I tried to use a URL instead of a file.
A critical error has occurred.
Public member 'FileName' on type 'String' not found.
Then I switched by template to the default and was able to enter a URL without issue. After saving the first record using the default template, I was able to switch my template back to my custom one and continue entering values without issue. I'm not 100% why this happened, maybe it has something to do with this being a completely new installation of DNN?
The second thing I ran into was easier to figure out. Maybe it is my template or mabye it is just me being a stupid user. If I create an entry that is a file, then I want to switch it over to being a URL it doesn't allow me to switch the type from File to URL.
Sorry about all of the confusion, everything was running like gangbusters on my dev site and when I moved to prod, things seemed to gotten interesting.