well, I did discover why the sidewalks didn't save in the standalone map 1...
"File Not Found (entitybank\\Purchased\Disturbing13\NightCity Reloaded Street Pack 1\Scenery\NCSidewalk_003.fpe)"
Gameguru couldn't find it, but I did.
The double slash maybe? All the missing items have the "entitybank\\Purchased" while the one's found have an "entitybank\" single slash or "Loaded 83:\Purchased\nomis3D\Misc\mokapot.fpe" .. could possibly be why gameguru keeps crashing when clicking on the Purchased link to add an entity... Or, maybe not.
sorry, guess I should put that info in the bug report I reported in...
Windows 10 64bit, Intel(R) Core(TM) i5-4590 CPU @ 3.30GHz, 3301 Mhz, 4 Core(s), NVIDIA GeForce GTX 960 2 gig GDDR5, 16 gigs ram