Thanks for the report, I'll fix this ASAP.

Here is my log if it helps. http://pastebin.com/4WEMxbk6

Uploading new version. Try again in a minute.

ok i'll test it
if it doesnt crash over the course of one hour it should be fixed vuz most times it happened like 5-40minutes after i loaded the world

The factory isnt locatable in the G menu any more, I typed in "nan" and nothing showed up. I started a new world to test it fearing something like this might happen. I loaded up a copy of my old world, its just gone, no collision box, no floating objects, no record or access of it in terminal view.

ok it isnt fixed i crashed again

log:

2016-04-10 04:30:22.315 - Thread: 1 -> Saving world - END
2016-04-10 04:30:22.318 - Thread: 6 -> Session snapshot save - START
2016-04-10 04:30:22.319 - Thread: 6 -> Checking file access for files in target dir.
2016-04-10 04:30:22.330 - Thread: 1 -> GC Memory: 1,476,524,976 B
2016-04-10 04:30:23.361 - Thread: 6 -> Session snapshot save - END
2016-04-10 04:30:52.341 - Thread: 1 -> GC Memory: 1,433,354,560 B
2016-04-10 04:31:07.994 - Thread: 1 -> Exception occured: System.ArgumentException: Destination array was not long enough. Check destIndex and length, and the array's lower bounds.
at System.Array.Copy(Array sourceArray, Int32 sourceIndex, Array destinationArray, Int32 destinationIndex, Int32 length, Boolean reliable)
at System.Collections.Generic.List`1.CopyTo(T[] array, Int32 arrayIndex)
at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
at NaniteConstructionSystem.Entities.NaniteConstructionBlock.ProcessRequiredComponents()
at NaniteConstructionSystem.Entities.NaniteConstructionBlock.<ScanForTargets>b__4()
at Sandbox.MySandboxGame.ProcessInvoke()
at Sandbox.MySandboxGame.Update()
at Sandbox.Engine.Platform.Game.UpdateInternal()
at Sandbox.Engine.Platform.Game.RunSingleFrame()
at Sandbox.Engine.Platform.FixedLoop.<>c__DisplayClass1.<Run>b__0()
at Sandbox.Engine.Platform.GenericLoop.Run(VoidAction tickCallback)
at Sandbox.Engine.Platform.Game.RunLoop()
at Sandbox.MySandboxGame.Run(Boolean customRenderLoop, Action disposeSplashScreen)
at SpaceEngineers.MyProgram.RunInternal(String[] args)
at SpaceEngineers.MyProgram.Main(String[] args)
2016-04-10 04:31:07.996 - Thread: 1 -> Hiding window
2016-04-10 04:31:08.003 - Thread: 1 -> Network readers disposed
2016-04-10 04:31:08.236 - Thread: 1 -> Hiding window done
2016-04-10 04:31:08.236 - Thread: 1 -> Showing message
2016-04-10 04:31:08.245 - Thread: 1 -> ERROR: branch name cannot be resolved, services=
2016-04-10 04:31:08.245 - Thread: 1 -> ERROR: branch name cannot be resolved, services=
2016-04-10 04:31:08.245 - Thread: 1 -> ERROR: branch name cannot be resolved, services=

also im sorry for bothering you with this i hope you dont mind too much >.<

No please continue with crash logs if they keep happening. This one is being annoying, lol.

Getting the same readout in my log after crash, happened when placing this block in creative mode.

Try again? I uploaded a new version that should have fixed it. If you get the same error, or something similar, please post it. Something is going sour right now with it, but it should be fixed.

Tested, im Green to Go, no issues so far. Thank you for your hard and quick work.

me 2
had no crashes during 4 hours of playing
thanks for fixing the issue :D

Still Crashing

Log:
2016-04-12 01:19:46.780 - Thread: 1 -> Exception occured: System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
at System.Collections.Generic.List`1.Enumerator.MoveNextRare()
at VRage.Game.Entity.MyEntity.RaisePhysicsChanged()
at VRage.Game.Entity.MyEntity.Delete()
at Sandbox.Game.Entities.MyEntities.DeleteRememberedEntities()
at Sandbox.Game.Entities.MyEntities.UpdateAfterSimulation()
at Sandbox.Game.World.MySector.UpdateAfterSimulation()
at Sandbox.Game.World.MySession.UpdateComponents()
at Sandbox.Game.World.MySession.Update(MyTimeSpan updateTime)
at Sandbox.MySandboxGame.Update()
at Sandbox.Engine.Platform.Game.UpdateInternal()
at Sandbox.Engine.Platform.Game.RunSingleFrame()
at Sandbox.Engine.Platform.FixedLoop.<>c__DisplayClass1.<Run>b__0()
at Sandbox.Engine.Platform.GenericLoop.Run(VoidAction tickCallback)
at Sandbox.Engine.Platform.Game.RunLoop()
at Sandbox.MySandboxGame.Run(Boolean customRenderLoop, Action disposeSplashScreen)
at SpaceEngineers.MyProgram.RunInternal(String[] args)
at SpaceEngineers.MyProgram.Main(String[] args)

doesnt look like it has something to do with the nanite factory tho

That one isn't the nanite factory.

I didn't have any random crashes until I installed Nanite Factory, so I figured most recent was the issue. Thank you