Missing slabs after loading a game

Hey guys,
after I loaded a game today, i got instantly this error:

develop-2951 (x64)radiant/modules/events.lua:83: assertion failed!stack traceback:
radiant/modules/common.lua:237: in function ‘report_traceback’
radiant/modules/common.lua:248: in function <radiant/modules/common.lua:242>
[C]: in function ‘assert’
radiant/modules/events.lua:83: in function ‘listen’
…h/components/entity_forms/entity_forms_component.lua:459: in function ‘_trace_ghost_pre_destroy’
…h/components/entity_forms/entity_forms_component.lua:466: in function ‘_start_placement_task’
…h/components/entity_forms/entity_forms_component.lua:64: in function ‘obj’
radiant/modules/events.lua:73: in function ‘instance’
radiant/modules/events.lua:206: in function <radiant/modules/events.lua:200>
[C]: in function ‘xpcall’
radiant/modules/common.lua:257: in function ‘xpcall’
radiant/modules/events.lua:200: in function <radiant/modules/events.lua:171>

I also have always the same problem with missing slabs after i load a game.
But the interesting thing is, i can’t build at the spots are missing. Always an X on my courser.

As u can see, a huge spot of slabs is missing. The game also shows me a white border around the missing slabs - seems like I never build there, but thats not true. U can also see at the right side of the place some missing slabs at the stairs. This happens always to lager places I build. When i build a house there isnt a problem after loading a game.

Im using a gforce 960 4gb ram.
Win 10 upgrade from 7. 64 bit
8 gb ram
amd 6300 3,5 ghz, 6 core.

edit: I’m not using any mods.
Just the latest version from steam. (alpha 16 with the update from yesterday)

edit: After loading the game the first time there were only the missing slabs at the right side on the stairs. After saving and loading it again, I got also the huge spot at the left. When I saved it and loaded it again, it was the same as u can see at the image…

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edit: from my other save-game: