Pure Music Memory Play

I recently downloaded new Pure Music software as a trial version. I have a Mac mini and had 2GB or Ram. I used memory play - with no problems. I recently updated my Ram to 8GB's and now when I have select memory play - it hangs up with 'Loading Music into Memory'....any suggestions? I tried finding a contact person on Channel D's website but could not find a contact....should I be using Amarra instead?

Incredibly frustrating...