I have a render where I have a glass window and I can see the background through the glass. Once I've rendered the image and export it, the window glass does not show the background, but is white (left image). I exported the image as a PNG and a TIF, with the same results. However if I use the Windows Snipping tool to save the rendered image, the background image through the glass window remains intact (right image).

I think it is some kind of alpha channel problem, but not sure how to fix it. From what I read, they said to save as a PNG or TIFF, which does not work for me. Any other suggestions?

Thanks!