I agree I have a not so great experience with the DFX Enhancer with the latest build that adds it's wonky driver to the mix.
Ironically I have this love hate relationship going on with DFX over the years.
After disabling this latest "Enhancer" driver that I had upgraded to.
I still use another of their products: iDFX
which enhnaces the individual tracks in my collection including Amazon purchases which can be automatically imported.
The thing is that this is designed to work within iTunes.
Which is fine for me in that I use iTunes on my HTPC which works and sounds great especially with the eye candy of AlbumFlow on a big screen with surround sound.
I also synch & transfer my "enhanced" music to my iPod(s) &
Once the track itself is enhance via iDFX the enhanced tracks can also be played in other media players like Windows Media player etc.
Kind of an ironic work around for sure but hey.
Bottomline it works at least for me.