Tapestry's ability to strip whitespace out of templates before renderring is love it or hate it. In many cases, it causes problems, especially for layouts that were created before the change.
The use of xml:space in the outermost elements of a template can turn this off, but it would be nice if it were possible to control this more globally.
I will add a symbol that changes the default behavior.
I will NOT make this dependent on production mode as I strongly feel you should test and use (day to day) what you will use in production.