That's why a copy of the forum rules is Stickied (at the top) in every forum.
Can't really help except to say I see the same issue. 8 bit tga works, 16/32 bit doesn't. Don't have many image apps to test in (certainly not PS) - old version of PSP (fails), a resonably recent Gimp (fails) and ImageMagik (fails).
Tested in Composite 32 and 64 bit (2012 and 2013).
Max 2016 (SP1/EXT1)
Win7Pro x64 (SP1). i5-3570K @ 4.4GHz, 8Gb Ram, DX11.
nVidia GTX760 (2GB) (Driver 430.86).