Render to texture renders ok but saved file is black

Hello,
I don’t know what in the hell I´m doing wrong but I need to bake a camera mapping and it renders fine when I do a render to texture. But the saved file in the disk is fully black, always.
I can save the render from the fram buffer but that is a tedious task if I have to do it with multiple objects.

Anyone is having this issue? How can I solve this?

I’m having the same problem. But I saw a different thread where they activated Vray Frame buffer and saved as EXR.

It works but why won’t it save jpg, png, tga?

Are you making sure the selected type of map is a vray map and not standard because if I select standard it renders fine in the buffer but the file/texture is black.