In both my Mac and PC versions of Photoshop CC, the background is white. I run Windows 7 64 6GB ram. Your file is correctly tagged sRGB which means the colors are correctly read. My PS color settings in both cases are NA General Presets 2. My browsers show white as well.
I tend to use a neutral gray interface instead of dark. I don't know if that influences how a picture looks to you.
Sometimes having an Adobe RGB workspace can make sRGB files take on a pink cast. Check "ask when opening" and select an sRGB option.
Using the eyedropper, the white background is 255,255,255 pure RGB white.
This file opens instantly.
So I'll await any followup questions if you have any.
I wonder why on 3 different stations they all have issues loading this file? Oh well, I resolved the issue by adding the folder, so I can continue my work.
Thanks for checking.
Nevermind, @Work again and this is still so slow. It takes ages to love files inside the PSD or even clicking on any tools. Photoshop just comes to a crawl.