pngwrite.c issue

[Bloodknight]

So, 3rd time in a week I've crashed the engine in pngwrite.c

callstack of most recent: http://pastebin.com/SiBZQSbX

I will endeavour to be more diligent, since the crashes while in the same file has been at 2 different points, so they are not consistent, nor to they trigger consistently since I've repeated the work and not crashed. I haven't posted an issue on GitHub as I believe this need more exploring, the next week or so will decide if it needs to be promoted i guess.

For the record:

NVidia GPU

AMD CPU

64-bit build

Windows 10

DX9 (yeah yeah, I know)

[Azaezel]

http://i.imgur.com/n91JUWx.png might be that.