Iight, so i went thro today, to run a test. I replaced the existing 4 NPC groups that we knew were having issues, i also lowered all the "new" groups by 1. I published it as this with no roofs in place.
Group 1 Mid-Floor -----(no story) Fine
Group 2 Low-Floor -----(story) broke, but was able to finish
Group 3-5 Low-Floor ---(story) broke, but was able to finish
Group 6 Mid-Floor ------(no story) fine
Group7-8 On walkway to High-Floor (no story) Broke
Group 9-10 High-Floor -(story) seems fine
Group 11 High-Floor ---(story) seems fine
Later today i will try moving the story line start to the lower floor, but seeing as how some of the higher groups are having issues too, im not sure that it will help anymore.
Thanks for letting me know what you found. I need to investigate some more. Right now, I've got two theories. 1) Particular building materials are the culprit. 2) The issue is with buildings built high above the actual map. I need to do some testing to see if either one has any validity. I'll let you guys know what I find.