Because Flash ignores the color profile obviously. I think it's best to save without embedded color profile so it displayed evenly across browsers and os'es.
Btw not every browser displays colors in HTML correctly when color profile is embedded.
That ´s too bad
I ´ve used Imagevue for some years now but noticed this
when I uploaded portraits. The profile is the common sRGB and I never heard that Flash can ´t handle this common profile.