The PD viewer doesn’t seem to list when “load single frame only” is selected. I tried moving the time slider to the saved frame, in this case 599 and still no update. I get the min/max/average just no particle list.
This seems to happen in Manual mode (and is a bug, but not related to Load Single Frame Only as far as I can tell).
Switch to Auto mode and it should work.
I had incorrect IF==2 instead of IF<3 statements that turned off the populating of the top list in Manual mode as if it were in Stats mode.
Will be fixed in Beta 8.
Thanks, Auto mode works 
I wasn’t sure if it was related to Single Frame Only, it just happened to be what I was working on, and this was the first time I had noticed it happen, Single Frame was the only thing different than what I usually do. So it was just a guess that was the issue.