Hello,
i realized you have to clear the cache for every new project you start, right?
Because otherwise strange thing happen while alligning/calculating.
Hi Nedo
What mean under strange things ? 
Not need to clear it out everytime, its helpful if have larger project and so can reuse detected points again.
it not cache camera position only their detected points and reconstructed Depth maps…
i started a new project, new picture, but after the alignment it showed the old project file 
I then completely cleared the cache, restarted alignment and everthing was ok again.
Hi Nedo
i started a new project, new picture, but after the alignment it showed the old project file = NOT possible !!
next time if get in some sort of issues like this make screenshot, so we can eventually replicate it, If its a error.
the cache hold ONLY detected points or Depth maps. NOT a camera position, orientation or etc…