I don't know if this was posted before, did a search and didn't find anything, so...
I was updating AdAware the other day and found that my definitions files were dated July 5, 2003
I went to LavaSoft and found that there's a new version of AdAware 6.0 (build 181), and that they are no longer supporting the old builds of 6.0 (162 and previous).
So, if you're running build 162 and see that you have an old reference file, but it won't update, you better download the latest version.
AdAware 6.0 build 181