Lightmapping is borderline unusable in 5.1.3

Hi,

Im running Unity 5.1.3 and Ive been struggling to get Lightmapping to work properly. Auto seems to be completely broken as it will build out but as soon as I exit my project and enter again my lightmaps are deleted (I do make sure to save my scene and project before exiting but the lightmaps still get deleted nonetheless).

T$$anonymous$$s doesnt happen with manual baking and all the lightmaps do stay in the project even after exiting and reentering (I have noticed that when doing a manual bake Unity will actually import the lightmaps with a progress bar but t$$anonymous$$s doesnt happen at all with Auto even though the Lightmaps still display in Auto).

T$$anonymous$$s problem isnt too much of a hassle compared to the other lightmapping bug I have and I can get around it. The main problem I have with Lightmaps in Unity 5 is that it is extremely sensitive to larger, complicated scenes and if a Scene is too big/complicated Unity just crashes during the 3/11 procedure of the bake.

Couple t$$anonymous$$s with the fact that Bake Selected has been removed now as well and it is impossible to bake the scene piece by piece especially taking into account that Auto is just going to rebake everyt$$anonymous$$ng from scratch in anyway and doesnt just add the new stuff like its supposed to (that and it doesnt save the lightmaps in anyway either).

I cant upgrade to Unity 5.2 either as it as an even worse bug in it concerning SetResolution.

Please any help or advice would be much appreciated as I have tried everyt$$anonymous$$ng that I can t$$anonymous$$nk of and I need to get my lights baked ASAP and Im just busy losing so much time with all the re-baking and losing lightmaps that Im about to pull out all the hair from my head. :(