The problem is with template "TEST"..
1)Double check does the template name is "TEST"
2)maybe you've opened test template on other skin... try to open template called "TEST" on the style that you are using

cheers :)

I am having the exact same problem. I have added a template to my style called "products", added a file called products.php in the /forums folder, and then changed the file to reference "products" and I just get a blank page.

3.8.0 here...

--------------- Added [DATE]1232408213[/DATE] at [TIME]1232408213[/TIME] ---------------

Problem solved:

I was using an UPPER CASE template name in my php file. Once I changed it to lower-case, which matches the name of the template in the Styles admin it worked. :)