I'm trying to override the CCK formatter function in my theme to include the description field but strangely enough it doesn't get picked up by the system. When I put my 3 lines of code directly into includes/swftools.theme.inc it works fine.
Any ideas on this? Is it a CCK problem?

This is the function I'm trying to override:

theme_swftools_formatter_swftools

I have cleared all caches a few times..