Photoshop desaturating but lightroom is not (same file)

i'm sure has been asked million times before but..

 

basically, designed ad client on macbook pro (i design on pc).

 

using mac:

 

1. saved image using save web in photoshop cs4 (with convert srgb), , desaturated image.

 

2. imported psd lightroom , exported (with convert srgb), did not desaturate image.

 

i sent desaturated photoshop image , proper looking lightroom image on pc, , same. why happening? why mac needlesly desaturating save web image?

 

this not problem when save using pc.

 

thank you

could post screenshot of edit – color settings (with more options checked)?

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