En:Why are changes in templates / project files not reflected in the page display?

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Question: Why are changes in templates / project files not reflected in the page display?

Answer:

When a template (.tpl) or a project file (.ini) has been changed, you then need to empty the cache before the changes will be taken into account by the parser.

The reason for this is that the parser when rendering a page only checks for changes in the content file in comparison to the content in the cache in order to speed up the delivery of the page.
Normally templates and project files are rarely changed. Hence it would be a waste of time to include these in the check.