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sstjohn - Although the OP didn't include in his post important information (...such as what you asked for), if, as you suggested, his working color space was either grayscale or CMYK, no one would ever describe the effects on viewing the image in PS as,
"...slightly yet visibly more red or yellow...". He would see either no color at all, or slightly muted colors, NOT more saturated colors. Problems such as he described almost always come from more subtle changes such as not distinguishing between one RGB profile (eg, sRGB), and another RGB profile (eg, ProFoto), and this usually comes from poor color management practices such as assigning a color profile when they should have converted the profile, or posting to the web using some RGB profile other than sRGB.
Tom M