John,
Yes, I have edited sounds and use them in one touch settings. I have not had any issues doing that. When I installed the Gold Package I had the problem of sounds being substituted for those I had selected and saved. AJ said that was because the new sounds in the Gold Package had memory locations the same as the sounds I had selected.
Funny, I had to return my original SD7 too. It had a bad hard drive kit. AJ replaced the keyboard and now all is great.
I have to say, the SD7 is the best of all the keyboards I have ever owned. That includes many Korgs, Rolands, and Yamahas.
Oh yes, did you do the most current OS update?
Deane