Max 2014, daily 05/27/2014, it loose any exposure changing. It not appends with previous build.
Try to make a plane, put a light, do a render, stop it, change exp value, redo render and stop it. Exp value is 0,0
This is the same for all exposure values.
Max 2014, daily 05/27/2014 - all OK
Does it happen in new scene?
If not - try to reset current renderer or even better merge your old scene in new scene
Normal behaviour here too.
However, i can make Corona to reset exposure settings if i render scene via soulburn’s TexmapPreview script. Something similar was reported here: Problem with TexmapPreview from soulburn script and corona - Corona for 3ds Max :: Help Required - Chaos Forum
It appends in new scene and in existing, it’s the same.
With old daily it works fine. So, I’m working with old daily 
I confirm. This bug exists.
If it is a change of brightness image in VFB - then I catched it too((
Here too (legacy) and i told Ondra about it, hope to see a fix soon.
How often does it happen? What 3dsmax version do you use? Can you record me a video from start of 3dsmax to the bug demonstrating?
max 2014
I got it two times when rendering with region render. In some moment selected region became to lighter than it must be
As i said, normaly it doesn’t happen to me (max 2014), only when i try to use texmap preview script from Neil Blevins.
Ok, can you try it with build in folder 2014-color mapping in VFB testing ?
Yep, with that build i can’t reproduce such behaviour anymore. Everything normal.
I’ve updated the build, previous one did not interatively update color mapping when set from render settings dlg. Please test it thoroughly to make sure there are no problems left
Hopefully fixed for good
With Build timestamp: Jun 3 2014 23:37:22 it works fine, thanks Ondra.