Windows Region file header incorrect?

[The_Great_Sephiroth]

I have a problem with our main save. We played fine yesterday. I checked the log. No errors, no warnings. Tried to load tonight and got this one error.

Exception: Incorrect region file header! C:\Users\not.telling\AppData\Roaming\7DaysToDie\Saves\Navezgane\DHTA-v2.6\Region/r.1.-3.7rg
  at RegionFileSectorBased.Get (System.String dir, System.Int32 rX, System.Int32 rZ, System.String ext) [0x00061] in <673cee7f1b1143818476bdf642f7434b>:0 
  at RegionFileAccessSectorBased.OpenRegionFile (System.String _dir, System.Int32 _regionX, System.Int32 _regionZ, System.String _ext) [0x00000] in <673cee7f1b1143818476bdf642f7434b>:0 
  at RegionFileAccessMultipleChunks.GetRFC (System.Int32 _regionX, System.Int32 _regionZ, System.String _dir, System.String _ext) [0x00067] in <673cee7f1b1143818476bdf642f7434b>:0 
  at RegionFileAccessMultipleChunks.ReadDirectory (System.String _dir, System.Action`3[T1,T2,T3] _chunkAndTimeStampHandler, System.Int32 chunksPerRegionPerDimension) [0x000a5] in <673cee7f1b1143818476bdf642f7434b>:0 
  at RegionFileAccessSectorBased.ReadDirectory (System.String _dir, System.Action`3[T1,T2,T3] _chunkAndTimeStampHandler) [0x00000] in <673cee7f1b1143818476bdf642f7434b>:0 
  at RegionFileManager..ctor (System.String _loadDirectory, System.String _saveDirectory, System.Int32 _maxChunksInCache, System.Boolean _bSaveOnChunkDrop) [0x001f9] in <673cee7f1b1143818476bdf642f7434b>:0 
  at ChunkProviderGenerateWorldFromRaw+<Init>d__17.MoveNext () [0x008e5] in <673cee7f1b1143818476bdf642f7434b>:0 
  at UnityEngine.SetupCoroutine.InvokeMoveNext (System.Collections.IEnumerator enumerator, System.IntPtr returnValueAddress) [0x00026] in <c39a522eee05469b8171a6cfeb646c59>:0

This shows up in the in-game log as an incorrect file header for that region. The file is huge (4,800k) so I believe it is one of our bases. How can I correct this? Nothing has been added or removed. It just decided either to not save the region when exiting last night or to not like what was saved tonight.

 

[The_Great_Sephiroth]

Okay, the region 1, -3 is in the desert. My friend and I spent the last night there shooting zombies for fun. No base or anything there. We probably did minor terrain damage due to missing a shot or shooting through a zombie, but nothing is built there. No idea why that one didn't save when we exited. It seems to run fine now that the region-file has been deleted, so I'm going to restore my daily backup and just delete that one region-file and call it a day.