Thanks for that info. I had posted quite a while ago on the GO forum about the problem, but the response was more in the direction that the dops were the problem. While it was a used machine, it was new for me. As my old Seattle GM has been problematic with the dops since very early on, I was almost to the point of thinking that difficulty getting the dops secured was just the nature of the beast.
Hopefully this information will help others who may be finding it hard to get the dops secure.