Upping the delay to "Extra Long" seems to have done the trick. I wish I had known about this months ago... Matter of fact, I didn't even know this preference existed nor what it offers to the behavior. Anyways, thanks for the advice. I'll let you know if I have any more similar issues.
Thanks for this tip, Ray. It did make a difference.
I am also on a Mac with DW6. Shut down all programs except DW.
My other "helpers" are to shut down second screen. Close all but one php page in DW. Close all elements of DW except the one php page.
Remove "preview" option.
Do one "insert" page, save as a pre-set. Do the "update," save as that preset. Work through all the others the same way. As I have understood it, it is a memory leak on Mac with DW6 that Adobe never addressed.